To make the air clean,Beijing will close some companies________cause heavy pollution.A.thatB.whoC.what
“Students _____ made no mistakes in today’s exercises please raise your hands.” The teacher said.
--- Time for bed, Dear. --- Not yet, Mum. I _____ until I _____ going over my lessons.
--- Alex, did you find the old house that you used to live in?--- Yes, but with much difficulty, for my hometown has _____ changed over these years.
--- _____ free lunches _____ to students in all schools in China? --- No, only in the countryside.
Zheng He is _____ great pioneer in exchanging cultures _____ Chinese people today still rememberhim.