1By the end of the last month, I _____________ all the CDs of Justin Bieber.
A. collect B. collected C. have collected D. had collected
1You _________lose your way if you walk alone in the mountains at night.
A. may B need C. should D. ought to
1We didn’t start our discussion __________ everybody arrived.
A. since B. if C. while D. until
1Take the exam carefully, _______ you won’t get full marks.
A. but B. and C. or D. so
1We hope that with the help of the new skill, Liu Xiang can run ________than before.
A. fast B. faster C. fastest D. the fastest
1The students from Xinjiang enjoy staying in our school because everyone is ____ to them..
A. friendly B. gently C. happily D. politely
