解释句子:
1.Trees are used to clean air.
Trees are used ______ ______ air.
2.Please help me make this plane model.
Please ______ me ______ this plane model.
3.We can shop for many French foods in Shenzhen.
We can _____ _____ for many French foods in Shenzhen.
翻译句子:
1.你认为树木可以相互传递信息吗?
Do you think trees can _____ _____ _____ one another?
2这些化学物质很可能对人类和动物有害。
These chemicals _____ probably _____ _____ human beings and animals.
3.红旗在旗杆的尽头飞扬。
The red flag is flying _____ _____ _____ of the mast.