When he was young，he ________a great interest in science.
| A．developed |
| B．invented |
| C．made |
| D．discovered |
regular exercise is very important.It’s never a good idea to exercise too close to bedmme.
| A．If | B．As | C．Although | D．Unless |
Please call my secretary to arrange a meeting this afternoon, or ______ it is convenient to you.
| A．whenever | B．however | C．whichever | D．wherever |
volleyball is her main focus, she’s also great at basketball.
| A．Since | B．Once | C．Unless | D．While |
You can’t complain of being lonelyyou don’t make any effort to meet people.
| A．until | B．when | C．once | D．though |
—Look，the paint is starting to come off ________the wall is damp.
—Well，we’d better have the wall repainted some day.
| A．when | B．where | C．if | D．once |