I ______ along the street looking for a place to park when the accident ________.
| A．went; was occurring | B．went; occurred |
| C．was going; occurred | D．was going; had occurred |
16. There was so much noise produced by the machine outside that the professor had to ______ his voice so that it would not ________.
| A．rise; be drowned | B．lift; drown | C．increase; drown | D．raise; be drowned |
15. A group of children ______ around the old man, listening to him telling the story and they ______ when it came to something really exciting. 
| A．were gathered; held their breaths | B．gathered; held their breath |
| C．gathered; held their breaths | D．were gathered; held their breath |
14. Day and night, the little boy is at his compute
r, playing computer games, as if ______ with them.
| A．to have great fun | B．having great fun | C．having a great fun | D．to have a great fun |
13. In common ______ other boys of his age, my young son is looking forward to _______ the permission to date.
A． to; be given |
B．with; being given | C．like; being given | D．as; be given |
12. Your friend acts ______ he were a trustworthy person but as a matter of fact he seldom keeps_____. So remember not to trust him with anything important.
A. as if; his wordsB. as though; his word
B. even if; his promiseD. even though; his promises