Ted and his friends established a website offering useful information about thunderstorms ______ similar accidents happening.
| A．prevent | B．preventing | C．to prevent | D．prevented |
A cough is usually nothing to worry about unless it lasts for ten days.
| A． | or more | B． | instead | C． | at most | D． | only |
We had an anxious couple of weeks _____ for the results of the experiment.
| A．wait | B．to be waiting | C．waited | D．waiting |
--- Can you show me Mr. Jaffer’s office, please?
--- _____. But I don’t know if he is in at the moment.
| A．Thanks | B．Go on | C．Sure | D．You are welcome |
The manager believes prices will not rise by more than _____ four percent.
| A．any other | B．the other | C．another | D．other |
Although this ____ sound like a simple task, great care is needed.
| A．must | B．may | C．shall | D．should |