Mum didn’t go to bed _____ I came back home last night.
| A．until | B．while |
| C．though | D．because |
It is said that the terrible weather will ________ for another week.
| A．last | B．change | C．stay | D．become |
Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
| A．only if | B．until | C．so that | D．even though |
Poor Tim is too nervous to start his speech. Someone should remind him________.
| A．how to talk | B．whether to speak | C．what to say | D．when to tell |
Make a list of the things you want to buy. ________, you will surely forget some of them.
| A．Anyway | B．However | C．Otherwise | D．Therefore |
— Excuse me. Would you mind my using your dictionary for a short time? —________.
| A．No, you can’t. | B．It’s my pleasure. | C．Yes, please. | D．Not at all. Help yourself. |