Do you often e-mail your friends—No. I use WeChat (微信) more often， but I _________ e-mail my friends before.

When does your school____- At 5:30 p.m. Then I go home for dinner.

Hardly any people believe that a（n）meeting will lead to an enduring love.

The International Maths Summer Camp was held in Wuhan,____ the top students in maths from all over the world.

It isdangerous to allow the children who are ________ swimming in the river