—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 |
I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
| A．because | B．though | C．until | D．unless |
Which do you prefer to use to keep in touch with your friends，QQ__________MSN?
| A．and | B．but | C．or | D．so |
The volunteer spoke as__________ as she could to make the visitors understand her．
| A．clearly | B．more clearly | C．most clearly | D．the most clearly |
— Must I go to medical school and be a doctor like you，Dad?
— No，you__________，son．You’re free to make your own decision．
| A．can’t | B．mustn’t | C．shouldn’t | D．needn’t |
My old neighbour Charles felt__________ after his children moved out．
| A．lonely | B．safely | C．angrily | D．happily |