have you been at this school –For three years．

We tried to ring you back，Bryan, but we think we ______ your number incorrectly.

I couldn’t get through to you at home last night. You must have gone out then, ________? — Yes, I went to the cinema. [ ]

I won’t go to the concert because I______my ticket.

There’s no way of knowing why one man makes an important discovery __ _ another man, also intelligent, fails.