Mr. Black ______ my art teacher last term, but now he ______.A. was, isn’tB. is, isn’tC. was, wasn’t
He managed to become a great inventor ___ he left school at 16.
Yesterday morning I was just leaving_________the telephone rang.
---What’s wrong with you, Dave? ---My homework can’t be __________ on time because I’ve left it at home.
We can’t work out the physics problem. Can you tell us ____?
— What did you do last Sunday? —_____________________.