To qualify yourself for this kind of new job, I recommend that you _____ some online courses.
It suddenly occurred to him __________ he had left his keys in the office.
—Do you think their table tennis team will win the first place at the coming Asian Games? —__________. Ours is much stronger than theirs.
The death rate is __________ pigs and recovery usually __________ within 7—10 days.
__________ is certain is __________ prevention is more important than treatment.
I asked him __________ we had to go. He told me just two more miles.