By the end of the 21th century, scientists _________ the cure for the common cold.

     A. will have discovered                                      B. had discovered

     C. will discover                                                  D. are discovering

Some day of rest may help to _________ the pressure of work.

     A. lower                        B. increase                    C. raise up                     D. reduce

Not all teenagers are well-_________ for their future job when they are at high school.

     A. interested                 B. concerned                 C. prepared                   D. satisfied

Bill asked Tom where _________ .

     A. he was going now                                          B. he was going then

            C. is he going now                  D. he is going then

If he _________ the doctor last week, he wouldn’t be suffering now.

     A. see                            B. didn’t see                 C. saw                           D. had seen

Ellen didn’t get_________ very well _________ her roommate.

     A. on/with                     B. on/to                         C. up/with                     D. up/to

Strict _________ measures are in force in the capital to protect it from terrorism.

     A. transportation           B. normal                      C. security                     D. scientific

We interviewed a number of candidates but none of them _________ us.

     A. impressed                 B. impression                C. impressive                 D. impressively

The old market is said _________ in a fire two years ago.

     A. to be destroying                                             B. to be destroyed       

     C. to have destroyed                                          D. to have been destroyed

My teeth were a little yellow so I _________ by the dentist.

     A. had had them cleaned                                   B. had cleaned them

     C. had them cleaned                                           D. is cleaned