It’s an ________well (井). Stay away from it.

Teaching as a career is          to many people owing to the long holidays.  

–We should use      methods to deal with different incidents. You know, anything can happen in that situation.–I got it. Thank you for reminding me.

After playing football for more than half an hour, the students took ______ rest.

Children are always asking all kinds of questions because they are ______ about the world they live in.