---You haven’t said one word about the design, Joe. What’s your idea?
---Sorry. I________about something else.
| A．thought | B．am thinking |
| C．was thinking | D．had thought |
33．The little boy ran away_________I could asked him something about his lessons．
| A．until | B．when | C．before | D．Since |
32．—You are so strong．
—Yes，I often________in the gym．
| A．help out | B．work out | C．make out | D．turn out |
31．—Bad luck! I have left my dictionary at the dormitory．
—__________．
| A．Here is it | B．Here are you | C．Here it is | D．Here you are |
30．The extra room________very useful when we had visitors．
| A．had been proved | B．was proved |
| C．had proved | D．Proved |
29．Don’t touch anything．Better leave things_________they are until the police arrive．
| A．before | B．that | C．as | D．While |