After a 3-week winter vacation, students usually _________some weight when they return to school.

ago we didn’t know this, but recentscience ______that people who don’t sleep well soon get ill.

Do you have any idea________– Most people think it is the terrible weather. And I think so.

The explorer got a disease in blood for the _____of vegetables and fruit[ ]

To keep healthy,Professor Johnson _______ cycling as a regular form of exercise after he retired.