—I saw you come to school by bus this morning.—Oh, I _______ come to school by bus, but it is raining today.

Andy is very tall, but I’m _______. 

 ----_________ do you have an English party?---- Once a month.

The boy doesn't speak       his sister, but his written work is very good.

-- Is air the lightest thing in the world?-- Not            . Scientists from Zhejiang University have just developed the world’s lightest material.