If better use is ________ your sparetime，you’ll makegood progress in doing your business

Not only __________ interested in football but _________ beginning to show an interest in it.

I thought we’d be late for the concert, _____ we ended up getting there ahead of time[ ]

Try to buy one before all the tickets _______.

Look at the boy running on the ground. Is it Frank— It ________ be him. I saw him go to the library just now.