— David, is this your sister’s bike?— No, it’s not ______. It’s my brother’s.

----Are Mr. and Mrs. Wang living alone in the house? ----Yes, altough they have three sons,      of them live with their parents.

－How about the pollution in the countryside?－Luckily, it’s not as serious as _______ in the big cities.

I think _______ is meaningful to help other people.

－Oh, the traffic is too heavy.－Let’s change ________route to the airport.

You are old enough to make decisions by __________.

—What’s the girl’s name? —______name is Linda.

—This boy is my friend. _______ name is Tom.—_____ name is Mary. Nice to meet you.

—Do you know(认识) that girl?—Yes. _____ name is Mary.

—What’s that? —_____ is an eraser.

—I’m Bob. What’s your name?—Mary. How are you?

Most students like dinosaurs, but ______ of them know the story of dinosaurs.

The girl is doing          homework.

一 Hi, Jim! Is this your bike or Mary's?— It's mine, not         .

I found a story-book on the desk, it isn’t mine, it is ___,I think.

—Is this       ruler?—No.       is over there.

Nobody teaches me English. I learn it all by______. 

I think _________ necessary for students to take an interest in all subjects.

—Yesterday I lost my pencil sharpener.  I couldn’t find_______.—Oh, it’s a pity. You’d better buy ________ this afternoon.

Jack is a famous writer. ＿＿＿new book is very popular.