You’re coughing badly，Martin. Why not give up smoking?—Give up smoking？Easier said than done，Amy. Once you ______ the habit of smoking，it is very hard for you to ______.

come and join US. Jimmy! —I’m sorry, butI’m really busy now. If I ____ time, I would certainly go.

If he _______ tomorrow, he would find Mr Wang in the office.

It was the third time that she ______to this mountain village to see the children.

No child likes being __________ at home while others go out to enjoy themselves.