Ex.2.

1...... is looking .....

2. ....has learnt....

3. How long have you known Paul? I known him for five years.

4. Has she fed the cat yet?

5. ...haven't seen .../... were...

6. Has she finished her homework yet?

7. Has your dog ever bitten/ bite
8. have just made
9. Have you ever been
10. started

Ex.3.

1.D
2.B
3.B
4.C
5.C 

                                                             GOOD LUCK.

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exercise 2:

1. is looking

2. has learned

3. have you known/ have known

4. Has she fed

5. haven't seen/ were

6. Has she finished

7. Has your dog ever bitten/ bite

8. have just made

9. Have you ever been

10. started

exercise 3:

1.D

2.B

3.B

4.C

5.C