IV/
1. were listening
2. hasn't done
3. riding
4. to contact
VI/ 1C 2D 3D 4B
VII/ 1C 2B 3C 4D
VIII/
1. Nam and Minh were not invited to the party
2. The teacher said (that) he/she was going to meet his/her sister in front of the bus stop the following day
3. If he were good at English, he could get the job
4. My father hasn't seen his brother for nearly twenty years
5. My car runs faster than his
6. Although Mr. Anderson didn't speak Vietnamese, he decided to settle in Ha Noi
IV
1 were listening
2 hasn't done
3 to contact
1 C
2 D
3 D
4 B
VII
1 B
2 B
3 C
4 D
VII
1 Nam and Minh weren't invited to the party
2 he was going to meet his sister in front of the bus stop the day after
3 He were good at English, he could get the job
4 seen his brother for 20 years
5 can run faster than his car
6 Mr Anderson didn't speek Vietnamese, he decided to settle in HN