The conference has been held to discuss the effects of tourism ______ the wildlife in the area.
| A．to | B．on | C．at | D．with |
One Friday,we were packing to leave for a weekend away my daughter heard cries for help
| A．after | B．while | C．since | D．when |
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 |