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
He thought he ________ a teacher two years later.
A. will be B. is going to be C. would be D. was
It’s too cold in the room. Please keep the door _______.
A. open B. closed C. close D. opened
