Tomorrow is Sunday. Jim will go hiking withhis friends if it ________.

If you are not familiar ________ the topic, you may write something that is familiar ________ you.

We must try our best to the river being polluted any more

ou read the book, you’d better make a mark _____you have any questions

Another reason _____ he didn’t mention is _____ thepoor quality of the buildings worsened the damage.