We can never expect bluer sky unless we create less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
—Come in and have a look．Where can you find a so high-quality gift for your loved ones?
—______．Thank you．We have no intension to buy．
| A．That just depends | B．Let us be | C．It’s nothing | D．Take it easy |
Have you any idea ______we can do to help those ______are in great need?
| A．how; who | B．what; / | C．whether; that | D．what; who |
_______ Tom, we wouldn’t have been late for the last bus.
| A．If we didn’t wait for | B．If we haven’t waited for |
| C．we hadn’t waited for | D．Had we not waited for |
The twin brothers stand under the tree, ______ and say nothing.
| A．puzzled | B．puzzling | C．being puzzling | D．being puzzled |
________ that I was puzzled.
| A．So difficult a question did he ask me |
| B．Such difficult a question did he ask me |
| C．Such a difficult question he asked me |
| D．He asked me a so difficult question |