All of my classmates ________ the Communist League（共青团）since 3 years ago. We are all proud of it and hope to make contributions to our country.
A.joined B.have joined C.have been in
—We'd better ________a taxi right now, or we won't get to the meeting on time.
—All right.
A.call back B.call in C.call up
Between two classes, we usually have a ________break to help to rest our brains. We should open the windows to breathe some fresh air during the break.
A.15-minutes B.15 minute's C.15-minute
A home without books is like a house without windows. Books are great ________in our life, which guides us to the bright future.
A.challenge B.treasure C.ceremony
Behind every successful man there are a lot of unsuccessful years. So dear students, don't give up when you meet with difficulties. Try ________second time, and success will finally belong to you.
A.a B.the C./
Which of the following words doesn't have the same stress as the others?
A.Therefore B.Ourselves C.Realize
