Thinking that the students were having an evening class, the teacher left the classroom, ______.
| A．slowly and gentle | B．slowly and gently |
| C．slow and gentle | D．slow and gently |
Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．when |
Every minute must be made full use of ____ our lessons, for the final examination is coming.
| A．going over | B．to go over | C．go over | D．to going over |
The foreigner does speak Chinese well, but of course not _____ we Chinese.
| A．as fluent as | B．more fluent than | C．so fluently as | D．much fluently than |
The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.
| A．how | B．which | C．why | D．because |
—Thank you for joining in our conversation tonight.
—_____.
| A．It’s my duty | B．It’s all right | C．It’s my pleasure | D．With pleasure |