1.Jack pretended  to     have known   £¨know£© everything about it and said nothing.

2.Ever since I was a child, I    have dreamed   £¨dream£© of organizing a trip to Tibet.

3.So charming is the scenery of Jiuzhaigou that it leaves a deep    impression   £¨impress£© on visitors from home and abroad.

4.You don’t have to be    obsessive    £¨obsess£© about your weight and eating habits.

5.   Standing    £¨stand£© at the top of Mount Tai, we are able to have a good view of the beautiful scenery of the whole city.