—Could you tell me __________?—Sorry, I don’t know.
— I’m not going swimming tomorrow afternoon.— ________. I have to clean up my bedroom.
— Look at the boy playing basketball on the ground. Is it George?— It ________ be him. He told me he would play basketball after class, but he’s not sure.
The thing that matters is not whether you fail or not, ________ whether you try or not.
Lanzhou is the only capital city that the Yellow River, the second ________ river in China, passes through.。
Only when the work is done ________ be able to go back home.