Every year _____ money and energy is spent on environment protection.
| A．large quantities of | B．a large number of |
| C．a large quantity of | D．a plenty of |
How did it that you made such a silly mistake?
| A．bring about | B．come about |
| C．come across | D．come on |
He was told that it would be at least 3 more monthshe could recover and return to work.
| A．until | B．as soon as | C．since | D．before |
When asked to explainhe did to make his students so fascinated with his lessons the teacher paused and thought deeply.
| A．what it was that | B．that what it was |
| C．what was it that | D．that what was it |
Robert is saidabroad, but I don’t know what country he studied in.
| A．to have studied | B．to study |
| C．to be studying | D．to have been studying |
The chargefrom 5 dollars to 50 dollars, depending on the quality.
| A．transforms | B．varies |
| C．trembles | D．evaluates |