—Hefei is a beautiful city, isn’t it?
—Yes. There are about two ____ visitors here week.
| A．thousands of | B．thousands | C．thousand | D．thousand of |
The kind teacher devoted all her time she had ___________ her students.
| A．help | B．to help |
| C．helping | D．to helping |
— It’s dangerous to walk across the street carelessly.
— You’re right. We can’t be careful while crossing the street.
| A．so | B．very | C．too | D．more |
It’s quite clever ________ you _______ out the problem.
| A．for; working | B．for; to work |
| C．of; working | D．of; to work |
---Tom, you play football in the street. ---Sorry, Ido it again.
| A．needn’t; won’t | B．mustn’t; won’t |
| C．can’t; will | D．won’t; can’t |
Not only Mr. and Mrs. Green but also their daughter ________ abroad twice.
| A．have gone | B．have been |
| C．has gone | D．has been |