1£®Modern science has given clear evidence that smoking can lead to many diseases.

2£®I made a promise to myself that this year, my first year in high school, would be different.

3£®She has some doubt whether her advice is of great value to us.

4£®We haven't settled the problem who will be sent to take charge of that chain shop.

5£®He often asked me the question whether the work was worth doing.

6£®I have no idea when the project will be finished.

7£®The problem which city we are going to£¬Qingdao or Dalian, is not decided.

8£®The teacher had no idea what was going on in the classroom.

9£®I have no impression how he went home, perhaps by bike.

10£®A warm thought suddenly came to me that I might use the pocket money to buy some flowers for my mother's birthday.