Active or passive put the verbs into the correct form

I. Active or passive? Put the verbs into the correct form.
1. There is somebody walking behind us. I think we (follow) are being followed.
2. Every time I print a document, the printer (break) is broken down.
3. Apples (say) is said to be good for our health.
4. Hoa (bear)was born in Hue but she (grow)grew up in Hanoi.
5. “Is Thanh’s house still for sale?” – “No, it (sell)has been sold since last month.”
6. The application form should (send)be sent today so that I (arrive) will arrive the next day.
7. How are cakes (make) made? have you (ever/ make) ever made?
8. I (see) saw an accident last night. Somebody (call) called an ambulance but nobody (injure) was injured so the ambulance (not/ need) wasn't needed.
9. “Who (invent)invented the microphone?” “It (invent)was invented by D.E. Hughes in 1878.”
10. The printer (break)was broken down yesterday, but now it’s OK. It (work)works again; it (repair) was repaired.
11. The professor (give)is giving a speech on history at the moment.
12. A research (do) has been done by the professor for three years.
13. An English-speaking club (hold) will be held in our school next year.
14. We (organize) are going to organize a workshop on environment this weekend.
15. Something (do) is done in our city to improve living condition so far.
16. They (take)took part in a contest last year.
17. We (go) will go home with you then. Do you agree?
18. Flowers (cut) are cut in the morning to sell in the market