Chia động từ trong ngoặc

19. Since I left Venezuela six years ago, I (return)......................................to visit friends and family several time.
20. As soon as my parents came, we (go)......................................out for dinner.
21. After ancient Greek athletes won a race in the Olympics, they (receive)......................................a simple crown of olive leaves.
22. I (answer)...................................... all of the questions correctly since I began this exercise on verb tenses.
23. Although it was noisy, I (keep)......................................on studying.
24. No matter what kinds of exercises he had taken, he (still/ put)......................................on weight.
25. I got a sore throat because I (speak)......................................for 3 hours.
26. Because she felt tired, she (go)...................................... to bed early.
27. I don’t like to speak English because I (be)......................................afraid of making mistakes
.28. I whispered because I (not/ want)......................................to disturb anyone