When people cut down big trees, new trees should be planted. ,they will have no trees to cut down in the future.
| A．If not | B．If so | C．If no so | D．If don’t |
______ all the required papers, he didn’t answer the questions fluently in class.
| A．Having not read | B．Not having read | C．Not read | D．Not to read |
When he reached the final line,everyone_____laughing.
| A．burst into | B．burst out | C．burst up | D．broke out |
The two elderly sisters, ____ so long, held each other.
| A．being separated | B．having been separated |
| C．to be separated | D．had been separated |
Harry Potter stories are____both the teenagers and adults.
| A．appealing to. | B．appeal to . | C．allergic to | D．appealing for |
In our class, girl students _____ nearly 60% of the students, and most of them study very well.
| A．build up | B．make up | C．take up | D．send up |