The sentence needs____ once more.
A survey of the opinions of expertsthat three hours of outdoor exercise a weekgood for one’s health.
Only when you showed the pass to the guardto come out our school.
When you come into our school yard, you will notice our beautiful school _____by green trees.
Your article is perfect but a little long, so you’d better ______ it in order to make it fit the demand of less than 120 words.
—Why do you look worried? — Because what I am really concerned about is _____my friend can do me a favor or not..