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Put the verbs in brackets into the correct tense. 1.   In 1543, Nicolaus Copernicus (publish)                          “On the Revolutions of the Heaven Spheres” claiming that the Earth and the planets (orbit)                             the Su. 2.   Galileo (use)                                 the telescope to view the stars and planets before Isaac Newton (invent)                                   the first reflecting telescope. 3.   In 1686, Isaac Newton (publish)                                     the Mathematical Principlesof Natural Philosophy where he (lay)                                the foundations for universalgravitation and (describe)                                       the motion of the Sun and the planets. 4.   After Robert Goddard (work)                              on the rocket technology, he(invent)                               and (launch)                          the first liquid-fueled rocket in 1926. 5.   On November 3, 1957, the Russian dog Laika (become)                        the first animal in orbit after fruit flies (be sent)                                to outer space by the United States. 6.   In 1983, Sally Ride (become)                              the first American woman inspace after Russian cosmonaut Valentina Tereshkova (be sent)                             in space twenty years earlier. 7.   France (launch)                            its first satellite before Japan(put)                      its test satellite into orbit. 8.   In 1971, the United Kingdom successfully (launch)                               its satellite into orbit after China (do)                              that one year earlier.

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Put the verbs in brackets into the correct tenses of the conditionals. 1.   If we (take)                      , the children (not go)                         for a walk. 2.   If she (not read)                           the novel, she (not pas)                                 the literature test. 3.   If I (not argue)                             with my friend, he (lend)                              me his motorbike. 4.   If we (take)                      the bus, we (not arrive)                                 in time. 5.   If Dick (not buy)                          the book, his friends (be)                               angry with him. 6.   If Tom (not tidy up)                                his room, Victoria (not help)                  him with the muffins. 7.   If the boys (not play)                               football, the girls (not come)                  to the football pitch. 8.   If you (eat)                       too much junk food, you (not lose)                      weight. 9.   If I (not make)                             breakfast tomorrow morning, my girlfriend (not love)                                  me anymore. 10. If they (not hurry)                                   , they (not catch)                                the train.

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Give the correct form of the verb in the box to complete the following sentences. 1.   Jack has a right to know. He ought to                              the news immediately. If you don’t do it, I will. 2.   I have no patience with gossips. What I told Bill was a secret. He shouldn’t have                        it to you. 3.   Use this brown paper and tape. A package has to                                    carefully before it is mailed. Otherwise, the post office won’t send it. 4.   I don’t know why Jessica wasn’t at the meeting. She must have                         about it. Next time there’s a meeting. I’ll be sure to remind her about it. 5.   The ancient ruins must have                     as early as 1974. The historical record is difficult to interpret. 6.   You should                       this button back on right away before you lose it. 7.   This burnt out light bulb should have                   days ago. There are some new bulbs in the green cabinet. Could you get one for me? 8.   Did you know that Sylvia bought a new sports car? I don’t know how much shepaid for it, and of course it’s none of my business, but it must have                           her lots of money. 9.   Shhh! Let’s not talk so loudly. We don’t want to awaken the baby. We’d better                           . 10. You’d better not drink that river water. It could                          .

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