We _____ last night,but we went to appreciate the flowerbeds and streetlights in Tian’anmen Square instead.
| A．might study | B．could study |
| C．should have studied | D．must have studied |
His eyes ________ on the PPT, Lee listened to the teacher ________.
| A．fixed; attentively |
| B．have been fixed; carefully |
| C．fixing; interestingly |
| D．fixed; purposefully |
Mom, don’t you think it's OK to play once in a while it doesn’t affect my studies?
| A．even if | B．unless |
| C．so that | D．as long as |
______ you have made a promise, you should carry it out.
| A．Once | B．Until | C．For | D．While |
If you ______ stealing in the supermarket, you’ll be sent to the police station immediately.
| A．catch | B．are catching |
| C．will be caught | D．are caught |
—My Dear! I've just missed the lecture.
—That's too bad.I'm sure you it if you had got up earlier.
| A．could have caught | B．had caught |
| C．would catch | D．could catch |