Jack’s mother was twenty-seven when he was born. Jack is eleven this year. How old is his mother?

______ of that country is covered by snow.

Simon is willing to help others __________ with their English.[ ]

How do you improve your listening, Mary? —Just ______ listening to tapes, it’s a good way, you know. [ ]

We ‘ll be back for our school’s _____anniversary (周年) ceremony . -I see. That means you’ll have a get-together with your classmates in ____years .