14/ It is very difficult to make him laugh.
12/ Mr Tam drives carefully.
13/ The women is rich enough to buy what she likes.
14/ It is very important to be on time.
15/ We are very sad that the teacher is ill.
16/ We are very happy to keep the friendship for a long time.
17/ It's not difficult to learn to ride a bicycle.
18/ It's dangerous to drive in the rain.
19/ It's not safe to drink this water.
20/ It's impossible to give you any more information.
21/ It's cheap for you to travel by train.
22/ It's hard for him to learn to use the computer.
23/ It's expensive for us to live in that city.
24/ It's very nice to talk with you.