—Can I pay the bill by check? —Sorry, sir．But it is the management rules of our hotel that payment     be made in cash．

I＿＿＿＿＿＿Professor Jones had taught me this question. 

Teachers recommend parents________ their children under 12 to ride bicycles to school for safety.

___________it__________to rain tomorrow , the sports meet would be put off until the same time next week.

At first sight, it ________ look like a generous offer; actually, it is a trick.