Historical dramas are quite boring to me, but I don't usually watch them.

                                     A               B                C                  D

It was such a difficult homework that it took me two hours to finish it.

            A          B                                  C                                           D

Although his family is poor, but he studies very well.

                                       A            B           C               D

The teacher asked him why hadn't he done his homework, but he said nothing.

                                              A              B                                     C              D

I often look into new words in the dictionary whenever I don't know their meanings.

                   A                        B                                C                              D

Even on the most careful prepared trip, problems will sometimes develop.

         A                            B                     C                                       D

Either the doctor or the nurses takes care of changing the patients' bandages.

          A                                             B                      C                  D

They hardly never go to the beach because of their thickness, do they?

                          A                        B              C                                       D