III. Choose the best one (A, B, C or D) to complete the sentence or replace the underlined word.

Chen ________ us that air pollution _________ a serious problem in Beijing.

VIII. Rewrite the sentences without changing the meaning of the first ones.

They don’t understand the problem. They won’t find a solution.

=> If they _____________________________________.

Tom said to his sister “I want to buy a gift for our mother”.

=> Tom told ___________________________________.

It's not necessary for you to do the test.

=> You_______________________________________.

We want to visit a temple. It opens at 7.00.  (that)

=> The temple__________________________________.

What is the main idea of the passage?

IV. Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

If businesses want to protect the environment, they will aid the local community and educating travellers.