______ a teacher, his main duty is to help the students become better learners.
| A．As | B．By | C．About | D．With |
is a good idea to bring your camera because you may want to take photos of the autumn leaves.
| A．This | B．It | C．That | D．What |
The young man plays violin very well, but he plays basketball badly.
| A．the; the | B．a; a | C．a; the | D．the;不填 |
You ______ wear sports shoes when you climb a mountain.
| A．can’t | B．shouldn’t | C．mustn’t | D．have to |
Thomas wants to know ______Nina lives.
| A．where | B．who | C．what | D．if |
He didn’t go there yesterday, _______he?
| A．did | B．does | C．didn’t | D．doesn’t |