Can 16-year-old students drive to school? No, they shouldn’t ______ to drive because they aren’t serious enough.

--- How beautiful your school is！-- Yeah, it      to be one of the most beautiful schools in our city. 

Every year lots of trees ____________ to make our country more beautiful.

In the past the children were made ______15 hours a day.

There was a big earthquake in Japan, but luckily many people _______.