—What about your mother， Tina?
—She doesn’t know .
| A．when would the train arrive |
| B．where could I get the book |
| C．what has done |
| D．who left the message |
How about_________out for a walk,mum?
| A．go | B．going | C．to go | D．goes |
--- I think English is very useful.
--- . And we must learn it well.
A. I agree with you
B. I don't think so
C. It's nice of you
---do you want to be when you grow up?
--- I want to be a pilot and fly in the blue sky.
A. Which B. Who C. What
--- It is very cold this winter.
---Yes, but it was colder last winter, I remember.
A. already B. even C. more
I think _is impossible for me to climb such a high mountain.
A. it B. this C. that