It’s smoggy these days. That’s terrible!—– Yes, I hope to plant trees.________ trees, ______air pollution.

The book was written in _________ easy English_________ even primary school students could understand it.

It is such wonderful advice that I would be glad to take it without a word.

Mobile phone users have developed a series of symbols, such as and to show ________ they feel

The French book must be Li Ying’s. She’s theonly one who’s studying French.