It was hard for him to learn English in a family,in which _____ of the parents spoke the language.
If you ___ smoke, please go outside.
I wasn’t sure if he was really interested or if he ___ polite.
As he reached ___ front door, Jack saw ___ strange sight.
What would have happened, ___, as far as the river bank?
Our chairman hasn’t come yet. If he ___ on time, we would have to put off the meeting