I'm sorry you've been waiting so long, but it'll still be some time _______ Sundance gets back.
| A．until | B．before | C．after | D．since |
－Have you been to Liuyang?
－No, I'd like to, _______.
| A．too | B．either | C．yet | D．though |
A new bridge _______ across the river in Changsha and it is expected to open next year.
A. is built B is being built C. are built D. has been built
—Must we get everything ready before we go to the countryside this summer? —No, you _______.
| A．mustn’t | B．won’t | C．don’t have to | D．can’t |
_______ entering the classroom, remember to take your seat and turn off your cell phone.
| A．At | B．From | C．Upon | D．As |