Ex 1:
1.A 2.A 3.A 4.C 5.D
Ex 2:
1.C 2.B
................
Ex 3:
1.is
2.lives
3.received
4.have
5.eat
6.cooks
7.is
8.wrote
9.introduced
10.sent
Ex 5:
1. is looking
2. has learnt
3. How long do you know - has known
4. Has she feeded
5. haven't seen - were
6. has she finished
7. Has your dog ever bitten - bit
8. have just made
9. Have you ever been
10. started
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