--______ will you come back? --- In an hour.
| A．How soon | B．How often | C．How long | D．How far |
Pleasewhen the train will leave.
| A．find out | B．look after |
| C．look for | D．ask for |
It is difficult______ me _______ English well. But I’ll study harder.
| A．to, learn | B．for, learning |
| C．for, to learn | D．to, to learn |
We should protect the earth because it’s home to _______animals.
| A．million | B．millions |
| C．million of | D．millions of |
Tom’s computer costhis brother’s.
| A．as many as | B．as much as |
| C．as more as | D．as most as |
He is not good at learning English and he always does his homework_______.
| A．quiet | B．slowly | C．quick | D．careful |