With sufficient scientific information amanned trip to Mars should be _____.

How long is it ______ you picked up your badmintontraining—It was not until my finance became better lastDecember _____ I started the training.

Rod loves_____ clocks. However, he is never able to put them together again.

How do you think he managed to improve hisEnglish in such a short time—______ four hours on it every day

The fact ________ this country spends more on its military than on education and health carecombined is a serious and worrying thought.[ ]