The manager was concerned to hear that two of his trusted workers ______.
| A．will leave | B．are leaving |
| C．have left | D．were leaving |
is a fact that English is being accepted as an international language.
| A．There |
| B．This |
| C．That |
| D．It |
It is pretty well understoodcontrols the flow of carbon dioxide in and out the atmosphere today.
| A．that |
| B．when |
| C．what |
| D．how |
It was not until the beginning of the meeting he realized_I told him was the only possible way to deal with the problem.
| A．that; what |
| B．what; that |
| C．when; what |
| D．when; that |
--- We haven’t been to the Great Wall for ages.
--- No, I don’t remember how many years ago I last visited it.
| A．it was that |
| B．was it that |
| C．it was when |
| D．was it when |
Mr. Johnson, I’m terribly sorry to you, but there’s someone waiting outside to see you.
| A．break |
| B．interrupt |
| C．pause |
| D．block |