I.1 sit

2 hasn't arrive

3 in order to

4 to connect

5 talking

6 whether

7 made

8 while

9 wonder

10 learn

II.1 didn't go

2 had watched

3 have seen

4 to buy

III.1 Would you mind giving me that book?

2 He asked me if I went to Hanoi

3 Paper is recycled every year

IV.1 Would you mind if I asked you questions?

2 It is dangerous to go near the fierce dog

V.1 went

2 postcards

3 Pyramids

4 took

5 home

VI.1 Ha Long Bay is popular with both Vietnamese and international tourist

2 Yes they can

3 No

4 Dau Go cave is one of the most beautiful caves at Ha Long