I.Change the following sentences to make them more concise:
1.It is difficult to make an estimation of how much money it would cost.
2.The time for learning is the time of youth.
3.He had the entire control of the whole trade.
4.I think the time has come for us to leave.
5.We must remember the past history.
6.There is a small river which separates the two villages.
7.I was late due to the reason that there was a traffic jam.
8.His story is a strange one.
9.The question as to whether we should go there on foot or by bike has not been decided.
10.There are some students who do not care much about others.
参考答案：
1.It is difficult to estimate how much money it would cost.
2.Youth is the time for learning.
3.He had control of the trade
4.I think it is time for us to leave.
5.We must remember the history.
6.A small river separates the two villages.
7.I was late because there was a traffic jam.
8.His story is strange.
9.Whether we should go there on foot or by bike has not been decided.
10.Some students do not care much about others.
