You _____ throw litter on the streets.
A. mustn't
B. couldn't
C. needn't
D. won't
ĐÁP ÁN: A
Dịch: Bạn không nên vứt rác xuống đường.
I don't understand this point of grammar. I wish I ______ it better.
The new political party came to the ___________after the general election.
I was only in Miami for a week. I wish I ______ more time there but I had to go on to New York.