____ your friend _____ the guitar at the concert（演奏会）— Yes, he will.

I guess we’ve already talked about this before but I’ll ask you again just

Some students even have no idea of　　　they are studying, so they are aimless most of the time

_ you may have, you should gather your courage to face the challenge.

y you shall not come into the study ________ I swore to devote myself to settling the problem, unless permitted.