I.

Part 1.

1. wasn't seen at the party by anyone last night

2. weren't very cold today, we could go swimming

3. had had enough money, I could have bought a new motorbike

4. the end of the 1920s that they introduced sound to movies

Part 2.

5. I am saving money to study abroad

6. What do you often play sports for

7. I think our students should study hard to pass the final exam

8. A new school has been built by the government

2.

Part 1.

1. 1915 did cinema become an industry 

2. was being done at 6pm last night

3. he had prepared for the interview, he would have got the job

4. I didn't stay up late, I wouldn't be tired

Part 2.

5. I entered the room quietly in order not to wake my baby up

6. The machine has been managed by John for two years