By the time Billy was 6, he in the sea.
| A．had already swum | B．was already swimming |
| C．has already swum | D．already swam |
Many experts stick to the view _____ teacher development is the key to the education quality.
| A．which | B．what | C．that | D．where |
When I wanted to express my thanks to him，words ___ me. I just held his hands firmly and choked.
| A．left | B．fled | C．forgot | D．failed |
Don’t worry. Intelligent students can always _______ good solutions to problems.
| A．come up to | B．come up with | C．stick to | D．deal with |
Nowadays children have to take arts, music and sports classes in their free time ____ busy schoolwork.
| A．rather than | B．owing to | C．apart from | D．expect for |
Finally, the two brothers climbed up the last floor, ________.
| A．hungrily and tired | B．hungrily and tiredly | C．hungry and tired | D．hungry and tiredly |