1. I have learned how to swim since 2010. ( How + to + V1)
2. She has worked for this bank since she leaves left the university. ( dùng thì HTHT vì có since)
3. How sweet voice you have! ( Câu cảm thán)
4. I go to the school library to borrow books twice. (bỏ hoặc thêm a day)
5. Can you tell me the way to the post office? (could là ở quá khứ, phải dùng can)
6. I received a letter to → from my friend last week. (receive + from: nhận từ ai đó)
7. I have gone → been to Singapore three times. (have been to s.w)
8. My brother can't swim, so → because he is afraid of water. ( sự việc 1 với 2 có liên kết với nhau, dùng because)
9. Don't eat too much salt because it is not good to → for you. ( good + for)
10.- "Which → What is the most expensive city in the world?" - "I think it's Tokyo."( nếu là which thì phải đưa ra các đáp án để chọn)

#Chúc bạn học tốt

Xin hay nhất ak. Thanks

$@Thienmunz24$

1. swim -> to swim vì V sau how phải có to

2. leaves -> left vì sau since phải chia V ở thì qk

3. What -> how vì cấu trúc How + adj/adv + S + V

4. twice -> tiwce a week

5. could -> can

6. to -> from 

7. gone -> been 

8. so -> because

9. to -> for

10. city -> cities