-How much difficulty did you have_______ this problem? -_______. It's quite easy.
Three years has passed _________ they came to this school.
The house is made _________ bamboo and it is made _________ six rooms.
—You are late again. The class _________ for five minutes. —Sorry. There’s something wrong with my bike.
Accidents are often caused by drivers who try to _________.
—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.