-Is it all right if I sit here?-__________,sir. The seats are for elderly people only.
_____everybody is here, Let’s set off.
I would like to do it_____I like it.
If you_____this experiment you will understand the theory better.
I don’t like to be interrupted if I_____.
I wonder if he_____us, and I think if he_____us we’ll be able to complete the task ahead of time.