Viết dạng đúng của từ trong ngoặc để hoàn thành mỗi câu

----- Nội dung ảnh -----
Viết dạng đúng của từ trong ngoặc để hoàn thành mỗi câu.

1. I have ____ memories about my trip to Sentosa in Singapore. (forget)

2. Children nowadays are more aware of environment ____ than we did in the past. (protect)

3. The most memorable part of our ____ was the boat ride on the River Cam. (tourism)

4. England is very good at ____ its historic buildings and monuments. (preserve)

5. We are getting ready for our graduation ____. (perform)