–Look! A man is cutting a tree on the moon. --It ______ be true. The teacher said there is no air on the moon.
He feels lonely because he has no close friends ____.
If you are ____ trouble, please call me ____ 72335611.
When the teacher asks him, he always ____.
Mr. Li makes me ____, because it is bad for my health.
Tom didn’t go hiking with his classmates ____ his illness.