— Could you tell me something about the boy who helped you just now ?— Sorry, I know nothing about him. We are ______.
Bob swims _______ than I, but he doesn’t swim my brother.
I find this Math problem very ___ _. I believe the students can work it out .
The number of students in our school _______ 4,000 and a number of them ______ good at playing Ping-Pong.
You must be tired now. Why not ___________ a rest .
___________ you are, ____________ mistakes you’ll make.