All the teachers are _______ content with the students’ performances during the Drama Festival, which are _______ worth watching.

   A. very; quite       B. well; quite      C. well; well       D. quite; very

 It was not until he told me ______ what had happened.

A. that I knew                   B. did I know  

C. when I knew                       D. I had known

 The city, _______ by an army of 1,500 soldiers, was difficult to take.  

A. protected     B. defended     C. attacked       D. prevented

 _______ the pull of the earth, a rocket must reach a speed of 28440 km/h.

A. In order to flee                  B. So as to escape 

C. To escape                     D. So that to flee

 The fearless pirates kept _______ on the waters off the coat of Somalia, from the Gulf of Aden to the Kenya border along the Indian Ocean.  

A. knocking on                       B. knocking down

C. knocking about                    D. knocking at

 We all know that, _______, the situation will get worse.

A. not if dealt carefully with           B. if not carefully dealt with

C. if dealt not carefully with           D. not if carefully dealt with 

 We can never expect _______ bluer sky unless we create _______ less polluted world.

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

 I would appreciate it _______ you call back this afternoon for the doctor’s appointment.

A. that          B. if               C. which            D. whether

 Speaking of all the songs he has written, I think this is probably his _______ one.

A. better-known                  B. well-known      

C. best-known                        D. most-known

 The book didn’t _______ children probably because it employed too many scientific terms.

A. apply to          B. refer to     C. intend to        D. adapt to