We’d better set off，or it will be dark we know it.
| A．before | B．after | C．when | D．until |
It is ___ we depended in Japan.
| A．two years since | B．two yesrs for | C．two years when | D．two years ago |
How long did it take them to get ___ this river?
A.through B,over C.across D.till
This is an illness that can result in total blindness ________ left untreated.
| A．after | B．if |
| C．since | D．unless |
— We want someone to design the new art museum for us.
— ________ the young fellow have a try?
| A．May | B．Shall |
| C．Will | D．Need |
The little boy is dirty from head to foot because he ________ in the mud all morning.
| A．has played | B．is playing |
| C．has been playing | D．was playing |