He is only too ready to help others, seldom, _____, refusing them when they turn to him.
| A．if never | B．if ever | C．if not | D．if any |
American English has changed ________ time. There are several reasons ________ this.
| A．over; for | B．for; with | C．in; of | D．during; about |
He prefers to die rather than ________ to his enemies.
| A．give up | B．give out | C．give in | D．give off |
________ you understand the rule, you’ll find English easy to learn.
| A．As | B．While | C．Once | D．Whether |
—Why, this is Henry speaking.
—Oh, I’m sorry. I didn’t ________ your voice on the phone.
| A．recognize | B．realize | C．know | D．hear |
He spoke about the country as if he had been there, but ________ he had never.
| A．frequently | B．gradually | C．actually | D．finally |