It is uncertain____side effect the medicine will bring about，although about two thousand patients have taken it.
A.that B.what C.how D.whether
The other day，my friend John drove his car down the street at _______I thought was a dangerous speed and surprised everyone in the car.
A.which，that B.which，it C.as，which D.what，that
Peter has gone to Beijing, but I’m wondering why he ________ in such a hurry.
A. left B. has left C. leaves D. was leaving
Hurry up, kids! The school bus _______ for us!
A. waits B. was waiting C. waited D. is waiting
—What a mistake!
—Yes. I his doing it another way, but without success.
A. was suggesting B. will suggest C. would suggest D. had suggested
All visitors to this village _________ with kindness.
A. treat B. are treated C. are treating D. had been treated
