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