-----Mr. Smith, can I come to ask for some advice on my paper at any time? -----Yes, of course. .
______ the challenges, I become stronger than I used to be.
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.