We _ for a picnic if it _ rain this Sunday.

It’s generous _______ him to give so much money tocharities. Now he thinks it’s important _______him to help people in poorareas.

________ when your ticket has been checked will you be allowed to take the plane.

If you write something and send it immediately by email, which you ___later regret, there is no chance for second thoughts．

Mrs. Miller can’t forget thatterrible accident it happened so longago.