Someone called me up in the middle of the night, but he hung up ______ I could answer the phone.
| A．as | B．since | C．until | D．before |
It was ______ Asimov was eleven years old ______ his talent for writing became obvious.
| A．that; when | B．when; that | C．that; that | D．when; when |
—Sorry, I made a mistake again.
—______. Practice more and you’ll succeed.
| A．Never mind | B．Certainly | C．Not at all | D．Don’t mention it |
I’d like to ______ you _______ your success on the experiment.
| A．congratulations;on | B．congrgatulate;for |
| C．congratulations;for | D．congratulate; on |
It is generally believed that teaching is ______ it is a science.
| A．an art much as | B．much an art as | C．as an art much as | D．as much an art as |
He raised his voice to make himself _______ clearly by the audience.
| A．hearing | B．to hear | C．heard | D．hear |