When did you meet your English teacher— While I _________ a bike along Jiaomen River.

12.–I ____ becoming an astronaut (宇航员) when I was at school. — Really? Do you still think it will ____ ?

I saw Mr. Smith in the office at ten yesterday morning.—That’s impossible. He _______ an English party with us then.

There is so much noise in the yard that I can’t ________ my attention on my work.

I want to sing around the world _______.