—What are _____ in English?—They are _______.A. these , boxesB. these, box C. this, boxes
Air pollution has become__________ than ever before. We must do something to stop it.
Old Mr. Black lives happily with his three dogs.of them are part of his family.
—can you finish the report on food safety? — In two days.
The traffic is moving very slowly as so many carson their way back to Shanghai.
Students are encouraged to share their learning experience__________ their classmates.