People say that young Chinese students’ eyesight keeps dropping _________ because of both too much homework and poor learning conditions.

 If a person has not had enough sleep, his actions will give him ___ during the day.

The patient’s progress was very encouraging as he could ________ get out of bed without help.

   So far the young man hasn’t had any success; ______ he will keep trying.

Smiling doesn't     mean you're happy． Sometimes, it just means that you're strong enough to face problems．