It’s very difficult to learn English well , but you can’t___.
| A．put it up | B．take it up |
| C．look it up | D．give it up |
--What’s the advantage of shopping online?
--I think buyers _______spend a lot of time going to shops.
| A．shouldn’t | B．mustn’t |
| C．can’t | D．needn’t |
--What do you think of the 3-D printer?
--It’s great although it still needs further ______.
| A．invention | B．education |
| C．information | D．development |
_______valuable information you’ve offered us! Thanks so much!
| A．How | B．How a | C．What | D．What a |
This is ______ unusual course that is taught in ______ university, but it’s of no use to the real life.
| A．an, a | B．an, an | C．a, an | D．a, a |
I was just beginning to wonder _________.
| A．where are you | B．you are where |
| C．where you were | D．where you are |