We were about to leave the classroom _____ it began to rain.
You can borrow my car ___ you promise not too fast.
You'd better write down the phone number of the restaurant for future ____.
By 16:30, was almost closing time, nearly all the paintings had been sold.
――Look! Somebody ____the sofa..――Well, it wasn’t me. I didn’t do it.
It suddenly occurred to him___ he had left his keys in the office.