Professor White has written some short stories, but he is_______ known for his plays.
| A．better | B．more |
| C．the best | D．the most |
She has finished typing but she doesn’t know _______ next.
| A．what to do | B．how to do |
| C．what should she do | D．how she should do |
The kind teacher devoted all her time ___________ 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， I do it again.
| A．needn’t； won’t | B．mustn’t； won’t |
| C．can’t； will | D．won’t； can’t |