A man has 29 socks in his drawer, 9 identical blue, 8 identical grey and 12 identical black. The lights have fused and he is completely in the dark. How many socks must he take out to make certain that he has a pair of each colour

单项选择题B

单项选择题— Can I book a room from now until Friday—____________— What's the price— $128.75 not counting the service.

单项选择题— The radio蒺s terribly loud. Could you turn it down a little— Sorry!_________— Yes, and something else - wouldn't it be an idea to buy your own soap

单项选择题— Did you get any information from Peter— He ______an expert, but he doesn't seem to know much.

单项选择题No matter what measure they took, in no way __________.

单项选择题We wouldn't have missed the train if we______ to the station.

单项选择题The committee has made rules （）all its members are supposed to work.

A.by which
B.so that
C.now that
D.for which

单项选择题They were married for fifteen years but have now _______up and live apart.

单项选择题I set off as soon as I got the news about my grandpa's illness. Unfortunately, he _________at the hospital before I ____.

单项选择题The shipping authorities followed the ________of the unidentified submarine on their radar screens.