We considered him to be a true friend, ______did many others whom he had cheated
A. which B. as C. when D. though
---I haven’t got the reference book yet, but I’ll have a test on the subject next month.
---Don’t worry. You______ have it by Friday.
A. could B. shall C. must D. may
I sincerely request the honor of your _______ at my son’s birthday party to be held next Sunday.
A . admission B. entrance C. permission D. presence
The roof fell ______ the PLA men had time to rescue the child trapped in the house.
A. until B. unless C. before D. because
When he ______ the front door, he found his keys were nowhere.
A. would open B. opened C. had opened D. was to open
The university with two____ campuses has a student population of 50,000 in total．
A．unique B．separate C. single D．alternative
