22、Johnson had made up his mind to give it up, but on ______ second thought he determined to try ______ third time．

A．不填; a        B．不填; 不填        C．a; a         D．the; a

21、By the time I saw the angry expression on his face, I ______ exactly what I was having to face．But not for a moment ______ I should quit．

A．had known; I thought                                B．have known; had I thought

C．would know; I would think                         D．knew; did I think

20、---- Really, I don’t know ______ to join the army or to find a job after my graduation．

---- Why don’t you ______ your parents’ advice? They will surely help you．

A．if; take           B．whether; follow          C．if; give            D．whether; seek

19、______ more experiments and you will be able to clarify the procedure ______ they communicate information．

A．Design; in which                                        B．Designing; by which

C．Design; by which                                       D．Designing; in which

18、According to recent exploration to Mars, it may hold ______ water as previously thought．

A．twice as much             B．as much twice             C．twice much as        D．much as twice

17、---- Jack, what do you think of the event which not only promoted ______ of world hunger, but raised a lot of money to help those poor children?

---- That’s great!

A．awareness       B．contribution          C．direction       D．loneliness

16、Do you think ______ will bring ______ under control?

A．the men; natures                                       B．man; the nature

C．the man; the nature                                     D．man; nature

15、As days go on, I think that Beijing will become ______ the whole world pay close attention to．

A．where          B．what         C．which         D．that

14、______ again? I really look forward to the early coming of this day．

A．When do you think we can meet                B．Do you think when we can meet

C．When do you think can we meet                D．Do you think when can we meet