Liu Xiang has failed over and over again in the past years. And that's _________ he succeeds.
–Do you know ______?--Yes. It’s a ball.A. why she brought the boxB. what is in the boxC. how much the box is
It’s time ______ home now. A. go B. goes C. to go
–I ______ know you can play the piano so well. --Thank you. A. didn’t B. don’t C. can’t
These are my parents. They ______ workers. A. am B. are C. is
A ______ tree is near the river A. big B. old C. fat