in the meantime，help out，ahead of，hold up，be about to，sort out
1．The maths problem is too difficult for me to solve. Please help me out.
2．Let's meet for lunch. I'll call you ahead_of time to fix up exactly when and where.
3．Your computer won't be arriving till Thursday. In_the_meantime,_you can use Jude's.
4．I was_about_to go to bed when I heard someone knock at the door.
5．Unfortunately, my application was held_up by the postal strike.
6．It is difficult to sort_out the lies from the truth.
1．You should ________ your old furniture, because it will be useful some day.
A．hold back B．hold on to
C．hold up D．hold on
解析：选B句意：你应该留住这些旧家具别卖，说不定哪一天能派上用场。hold back“阻挡”；hold on to“守住；不卖某物”；hold up“举起；耽搁；支撑”；hold on“坚持住”，on是副词。
2．I don't really work here; I ________ until the new secretary arrives.
A．just help out B．have just helped out
C．am just helping out D．will just help out
3．It is reported that the Beijing-Shanghai High-Speed Railway will be completed in about forty-five months, about two or three months ________.
A．in the meantime B．in no time
C．against time D．ahead of time
解析：选D ahead of time意为“提前”，根据句意可知北京到上海的高铁将提前两三个月完工。in the meantime“在此期间；与此同时”；in no time“立刻；马上”；against time“争分夺秒地；尽快地”，三者与句意不符。
4．Put the kettle on to boil and ________ we'll cut the bread.
A．in other words B．on the other hand
C．in the meantime D．on the contrary
解析：选C句意：把水壶放上去烧水，与此同时我们切面包。in other words“换言之”；on the other hand“另一方面”；in the meantime“与此同时”；on the contrary“相反”。