I hope you _________ to my birthday party this evening.

It is a long time _____I saw you last． ——Yes．And it will be a long time _____ we see each other again．

It is thought that one billion people in the world,_____ is half the world’s workers, earn their living by farming.

The man _________ was a friends of mine.

As your spoken English gets better, ______ your written English．