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21. 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; very22. 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 known23. The city, _______ by an army of 1,500 soldiers, was difficult to take.A. protected B. defended C. attacked D. prevented24. _______ 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 flee25. 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 downC. knocking about D. knocking at26. We all know that, _______, the situation will get worse.A. not if dealt carefully with B. if not carefully dealt withC. if dealt not carefully with D. not if carefully dealt with27. We can never expect _______ bluer sky unless we create _______ less polluted world.A. a; a B. a; the C. the; a D. the; the28. I would appreciate it _______ you call back this afternoon for the doctor’s appointment.A. that B. if C. which D. whether
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