Do you know the person with __________ he always chatted online?—Yes, one of his QQ friends.

______ I do the laundry first?-No,you _____. You can do your homework first.

________ of my sisters are experts in agriculture. Helping the farmers improve their farming techniques _________their duty.

It ___________ that he has been ill for a long time.

That’s very kind _____ you, but I think I can manage it myself.[ ]