I was about to go to bed ________ there was a knock at the door.
A. while B. when C. as D. suddenly
—Be careful not to drop the Ming Dynasty vase.
—Yes, we can’t be ________.
A. too careful B. very careful
C. too careless D. careless enough
They asked him to tell them everything ________ he saw at the front.
A. what B. that C. which D. where
My uncle’s house in the downtown area is much smaller than ours, but it is twice _______ expensive.
A. as B. so C. too D. very
The other day, my brother drove his car down the street at ________ I thought was a dangerous speed.
A. as B. which C. what D. that
The street is beautiful, for there are trees on ________.
A. neither side B. either side
C. both side D. all sides
