The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．to be caused | B．to have caused | C．being caused | D．causing |
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A great number of students____________ said they were forced to practise the piano.
| A．to question | B．to be questioned | C．questioned | D．questioning |
In_________most countries, a university degree can give you________flying start in life.
| A．the; a | B．the; 不填 | C．不填; 不填 | D．不填; a |
—Here’s your change.
——_______________
| A．Thank you. | B．Don’t mention it. | C．No problem | D．With pleasure. |
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