21. --- Look! What's in_______ sky?
--- Oh, it's _______ UFO.I wish I could fly in_______ space some day.
A. the; an; / B. /; a; the C. the; a; / D. /; an; /
22. ---Is_______ necessary to learn another language? --- I think so.
A. this B. that C. it D. he
23. Mary insisted that she_______ not a thief.
A. would be B. was C. is D. must be
24. --- Beijing is considered_______ a great place. I will visit it next week.
--- Have you considered how_______ there?
A. as; going B. as; to go C. for; to go D. to be; going
25. --- Mary is very generous. --- Yes, she devoted all her money she owned_______ people in need.
A. to help B. to helping C. helped D. helping
26. He won the first_______ in the writing competition and got a_______ of$1000.
A. reward; reward B. award; prize C. prize; re