You can come here to ask me ________ if you have any questions.

________ you’ve finished your homework, you can go out to play with other kids.[ ]

He came to a point _____ there was no more road to follow, and before him he could see nothingbut a thick forest [ ]

_______ problem solved—We were trying to think of ________ wayout, but it was difficult to find one

I haven’t learned to ride a bike yet. I _______ twenty minutes ago.