— I don’t know next.
— Let’s ask our teacher for help.
| A．what to do | B．what should I do |
| C．how to do | D．how I should do |
All passengers ________ go through safety check before they take a plane.
| A．can | B．may | C．must | D．ought |
My father didn’t give up smoking _______ the doctor told him to do so.
| A．but | B．when | C．until | D．after |
Nowadays even the flats in small towns are much ________ than they used to be.
| A．expensive | B．more expensive |
| C．most expensive | D．the most expensive |
---________ has your English teacher been to England?
---Three times.
| A．How often | B．How soon |
| C．How long | D．How many times |
The APEC meeting was held ______ November , 2014.
| A．on | B．in | C．at | D．for |