I don’t know if he_______ tomorrow. If he _______, I will call you.

____ is it to ask her about that? She doesn’t know it either.

_____ are your trousers? — Black. [ ]

I want to return the book to John, but I can’t find him.–He­­­­______ the library. You can find him there.

.Do you know ______ to deal with the problem? Could you tell me?