It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.
.In that country about 80 percent of the population _____ farm.
– What are those men nover there?--- _________ Green Peace.
– I have a very bad cold.--- Well, have you ever heard of a saying which goes “_______ a cold and starve a fever?”
._______ lying on the floor, the old man was immediately taken to hospital.
The boy is not ________ he used to be; he looks ________.