It is uncertain ______ side effect the medicine will bring about, although about two thousand patients have taken it.
| A．what | B．that | C．how | D．whether |
—I like coffee with nothing in it. What about you?
—I prefer coffee ________ sugar.
| A．to | B．for | C．with | D．than |
So far, several ships have been reported missing ________ the coast of Bermuda.
| A．off | B．along | C．on | D．around |
I don't remember___________ to the airport that year.
| A．to be taken | B．being taken | C．having | D．to take |
A man does not know the difficulty of anything_________ he does it personally.
| A．although | B．if | C．because | D．unless |
There is a _________ of 1000 dollars for the return
| A．reward | B．prize | C．thank | D．praise |