--- Where is Jack? I can’t find him anywhere.
--- He ______ his homework upstairs.
| A．might have done | B．must have done | C．might be doing | D．must do |
A modern city has been set up in _________ was a wasteland ten years ago.
| A．what | B．which | C．that | D．where |
Don’t be ________ by products claiming to help you lose weight in a couple of weeks.
| A．taken off | B．taken in |
| C．taken away | D．taken out |
Meeting my uncle after all these years was an unforgettable moment, ________ I will always treasure.
| A．that | B．one | C．it | D．what |
It is pretty well understood_______ controls the flow of carbon dioxide in and out the atmosphere today.
| A．what | B．when | C．that | D．how |
— Let’s go to a movie after work, OK?
— _____________
| A．Not at all. | B．Why not? |
| C．Never mind. | D．What of it? |