It _______ long ______ we know the result of the experiment.
I found ______ not very difficult to keep away from the A/H1N1 Flu.
How long did you spend going through the jungle during the exciting vacation?—Going through the jungle _____us about three weeks.
What are you going to do if it________ tomorrow? —I haven’t thought about it.[ ]
What a surprise! Harry used to get nervous because he couldn’t organize his ideas well _________ to express _________ clearly.—Great, havent’t you heard, “Where there is a will, there is a way.” Let’s give him a big hand.