一．单项填空（共20小题，每小题2分，共40分）
1. ----- Who called me this morning when I was out?
----- A man calling _____ Robert.
A. him B. himself C. his D. 不填
2. I can’t concentrate _____ what I’m doing while the noise is going on.
A. on B. at C. in D. to
3. They _____ to escape from prison last month, and now the police are still tracking them down.
A. attempted B. succeeded C. managed D. tried
4. When the teacher asked us to write a composition in half an hour, most of us found it hard ____.
A. to finish B. to be finished
C. finishing D. finished
5. ----- We _____ gas. I’m afraid we can’t go much farther.
----- I know there’s a gas station ahead. Sure it will last us till we get there.
A. run out B. have run out
C. are running out of D. have run out of
6. ----- I’m sorry I stepped outside for a smoke. I was very tired.
