Part 3:

1. were invented

2. to finish

3. famous

4. are taking

5. painting

6. written

7. relatives

8. haven't played

Part 4:

1. best --> better

2. doing --> to do

3. very --> so

4. will come --> comes

Part 5:

1. Hoa said she was talking the two-month French course in this language center.

2. My father sometimes flies to Kualar Lumpur.

3. Since he was lazy, he didn't pass his exam.

4. The laptop which my mother gave me on my birthday is very modern.

Part 3.

1. was invented

2. to finish

3. famous

4. are taking

5. painting

6. written

7. relatives

8. haven't played

Part 4.

1. best - better

2. doing - to do

3. very - so

4. will come - comes

Part 5

1. she was taking

2. sometimes flies to

3. he was lazy

4. which my mother gave