Đáp án:
1. He has waited there for a quarter past six.
=> since
2. Surface mail is many cheaper than air mail.
=> much
3. They do their best to keeping the family happy.
=> keep
4. The armchair is in the living room, among the television and sofa.
=> between
5. Tourists usually have a bus to the countryside.
=> take
#CHÚC BẠN HỌC TỐT
#Nocopy
#Tiểu Khôn