How does Jack usually go to school—He ride a bike. But now he there to lose weight.

It is difficult for us to learn a lesson in life ____we’ve actually had that lesson.

－I’m going to spend my summer holiday in Hawaii.－What a lucky boy! _________ And don’t forget to send me a postcard.

In my opinion, it is very ____ of you to buy a car at such a high price.

“We‘ve missed the train！” “_____, there’ll be another in ten minutes”