-Is that your best friend Kitty?- No, it _________ be her. She flew to Singapore yesterday.
The radio is too noisy,please ________.
Young trees should ________ every day.
Lao She’s _______ are still popular. Lots of readers read them today.
I got out of the car, went ______ a gate and walked along a path.
---We haven’t seen Tim these days. ---He _______ America. A has gone to B has been to C is going to D will go to