---- Sorry, I have to ______ now. It’s time for class.---- OK, I’ll call back later.
People are encouraged to speak openly,but careless words are ________to hurt others’ feelings.
Our bodies are strengthened by taking exercise. ________,our minds are developed by learning.
Smoking is one of the ________causes of cancer,killing millions of people each year.
In a sports team each player has a clear role,and there are few occasions ________members are confused or uncertain about their roles.
—I’m green at everything. —Don’t worry. ________you get older,you will get more experience.