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 _______.