The dogs had fed by Huong before she went to school.

               A         B                          C             D

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

            A          B                                  C                                           D

In my opinion, physics are one of the most difficult subjects at school.

    A                                    B                      C                      D

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

                                       A            B           C               D

Linh has taken many cooking classes in order to want to improve her cooking skills.

                      A                                  B                           C          D

Stacy often goes shopping at the mall for please.

                   A              B                       C             D

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

                          A                        B              C                                       D

Thomas finished the Math test more fastly than all of us.

                        A               B                 C                    D