1. haven't finished (vì có "yet")
2. were written
3.have you been
4.chatting
5. had/was surfing
II..
1.B
2.C
3.D
4.B
5.A
6.D
7.D
8.A
9.D
10.C
III
1.a
2.d
3.b
4.d
5.c
IV
1.Would you mind giving me a hand now ?
2.If he didn't speak so quickly,I would understand him
3.In spite of his taking a taxi,he arrived for the concert
4,It is such a heavy suitcase that I can't carry it
5.He is the most excellent footballer
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