- The air pollution is terrible.
- It will be worse ________ we take action to protect the environment.
| A．if | B．unless | C．until | D．when |
We hope _______ members of the Red Cross.
| A．you to be | B．to be | C．you be | D．being |
This maths problem seems _____ for us to solve.
| A．easy enough | B．enough easy |
| C．easily enough | D．enough easily |
—Would you like to walk along Yueya Lake with me tomorrow afternoon?
—Certainly, ______ I am too busy.
| A．when | B．until | C．unless | D．since |
－Have you heard of Liu Qian from Taiwan?
－Sure! His magic performance is _______amazing for people ______forget．
| A．so; that | B．such; that |
| C．too; to | D．very, to |
Mrs. Green has a cute baby. It often smiles at you ______.
| A．friendly | B．lovely | C．happily | D．lively |