—I have a ______. What should I do?—You should see a dentist.

 There are a lot of _______ in our school. They work very hard.

There is something wrong with her ________ . She cannot see clearly. 

— I have ______ in learning chemistry. Could you help me with it?— Sure, I’d love to.

Tomorrow is ________, so I want to give a present to Miss Li.