To make the air clean,Beijing will close some companies________cause heavy pollution.A.thatB.whoC.what
—Would you mind________the window?It’s a bit cold.—_________.
He explained________why he didn’t come to our party yesterday.
This book is not_______for a six-year-old child to read.
You can________the cake_______ten pieces.
The chairperson is very modest.He never_________.