22、The experiment shows that proper amounts of exercise, if _______ regularly, can improve our health.

A．being carried out                                    B．carrying out

C．carried out                                          D．to carry out

21、It is uncertain _______ side effect the medicine will bring about, although about two thousand patients have taken it.

A．that                B．what                C．how                D．whether

20、Had I known about this computer program, a huge amount of time and energy _______ .

A．would have been saved                     B．had been saved

C．will be saved                               D．was saved

19、Do you think shopping online will _______ take the place of shopping in stores?

A．especially           B．frequently             C．merely              D．finally

18、After that, he knew he could _______ any emergency by doing what he could to the best of his ability.

A．get away with           B．get on with         C．get through          D．get across

17、-- Would she mind playing against her former teammates?

-- _______ She is willing to play against any tough players.

A．I think so.                                              B．I'm not surprised.

C．Of course.                                               D．Not likely!

16、_______ that's important is that you are doing your best and moving in the right direction.

A．One          B．All          C．Everything             D．Anything

15、For many years, people _______ electric cars. However, making them has been more difficult than predicted.

A．had dreamed of                                      B．have dreamed of

C．dreamed of                                          D．dream of

14、The school advisers help you talk through your problems but they don't give you any direct _______.

A．solution                B．target                    C．measure                       D．function

13、"You _______ have a wrong number," she said. "There's no one of that name here.”

A．need                 B．can                C．must                D．would