The U.S.A. is a country while China is a country.A. developing; developed B. developed; developingC. developing; developing D. developed; developed
Tom and Mary _______ to China last month.
--- What’s the use of this kind of fuel(燃料) ?--- It can make the train __________ fast.
---Help yourself to some chicken , Jim . ---__________________
In our class, Andy is the __________ . He always makes everybody laugh .
---The classroom is not________ clean ______it was yesterday .---Sorry, I forgot to clean it.