He stayed up very late that night． __________ he woke up in the morning， the sun was already high up in the sky．（ ）
A．UntilB．AfterC．WhileD．As
This photo makes me think of trip to the Great Wall last year．
Yeah，we had a great time there．（ ）
A．aB．anC．theD．/
______ the light，please．This is a room with enough natural light．（ ）
A．Turn offB．Turn onC．Turn down
The singer________ while still at school（ ）
A．has discoveredB．was discovered
C．discovered
Thomas is the________ player in the basketball team but he is the best．（ ）
A．shorterB．shortC．shortest
The man________ called yesterday wants to buy the house．（ ）
A．whoB．whatC．which