—It often rains in that area.Please take an umbrella with you.
—________.
| A．Well, it just depends | B．All right，you're welcome |
| C．Yes, take it with me | D．OK，just in case |
Evdence has been found through years of study______ children’s early sleeping problem likely to continue when they grow up.
| A．why | B．how | C．whether | D．that |
Everyone in the village is very friendly. It doesn't matter ____ you have lived there for a short or a long time.
| A．why | B．how | C．whether | D．when |
（2012江西卷）It suddenly occurred to him he had left his keys in the office.
| A．whether | B．where | C．which | D．that |
As many five courses are provided, and you are free to choose ______ suits you best.
| A．whatever | B．whichever | C．whenever | D．wherever |
Scientists study ____ human brains work to make computers.
| A．when | B．how | C．that | D．whether |