He is known _____ a scientist and famous _____ his research on rice.
| A．for; as | B．for; for | C．as; for | D．as; as |
If there ______ no water, there ______ no life on the earth.
| A．is, would be. | B．was, was. | C．were, would be. | D．were, would have. |
Millionaires are often very generous and __a lot of their money to charities to help the poor.
| A．give in | B．give up | C．give away | D．give off |
The student did not catch the last bus, _______, it began to rain cats and dogs.
| A．in the flesh | B．at times | C．what’s worse | D．back and forth |
______ you have tried it, you can’t imagine how pleasant it is.
A. When. B. Because. C Although. D. Unless.
The audience were ______ by his _______ performance on the stage.
| A．amazed; amazed | B．amazed; amazing |
| C．amazing; amazed | D．amazing; amazing |