Ⅰ.单句语法填空
1．I just wonder what it is that makes him so excited.
2．Young as/though she is, she is quite experienced in the work.
3．They were classified into different groups according to what they knew.
4．Everyone is_exposed (expose) to air pollution regardless of lifestyle choices.
5．Remember never to_betray (betray) the people's trust in you whatever happens.
6．No sooner had they settled themselves in their seats than the curtain went up.
7．She wanted the comfort of a large car and the low cost of a small one, finally she made a compromise and bought a mediumsized car.
8．I was about to give up when my father came and encouraged me to keep going.
