—Don't use my handkerchief to wipe the table，gentleman.
—Oh, I' m very sorry.I________clearly.
| A．didn't see | B．hadn't seen |
| C．wasn't seeing | D．can't see |
—Did you meet with the famous star yesterday?
—______ I had come a little earlier!
| A．If only | B．Only if | C．But for | D．For fear |
A lot of children never fully ______ their mothers until it is too late.
| A．urge | B．appreciate | C．accuse | D．motivate |
______ I admit that there are problems, I don't agree that they cannot be solved.
| A．As | B．If | C．While | D．When |
Small _____ it is, the pen is a most useful tool.
| A．because | B．so | C．if | D．as |
______ it is getting dark.，we’d better hurry
| A．And | B．But | C．Since | D．Unless |