二、单项填空（每题1分）
21. It’s comfort to know that so many people are donating money and food to the people in need.
A. /, the B. a, the C. a, / D. /, a
22. Don't bother Tom, he is with the experiment on water molecules in the lab.
A. focused B. fixed C. occupied D. concentrated
23. The government doesn’t know how to deal with the dangerous situation all the public are aware of at present.
A. where B. which C. when D. who
24. Alice is a character in the novel the movie is adapted by Tim Burton.
A. in which B. from which C. for which D. by which
25.It’s her first time that she by the school to participate in the contest.
A. was chosen B. has chosen C. chose D. has been chosen
