He keeps in the safe $3 million _____ of diamonds.
| A．value | B．worth | C．price | D．cost |
—It’s so nice to enjoy the sunshine here on the green grass.
—You________us a right place.
| A．had introduced | B．are introducing | C．have introduced | D．introduce |
—Is your school bigger than ours?
—Yes. I guess it is________your school.
| A．as twice the size of | B．as two thirds big as |
| C．bigger than half | D．one third bigger than |
The disease, ________, could spread very fast.
| A．unless well controlling | B．if not well controlled |
| C．when not to control | D．although not being well controlled |
To prevent cybercrime more efficiently, it is important to make new laws and create international standards for them similar to________concerning international airspace.
| A．that | B．what | C．one | D．those |
I________have gone the concert because I know nothing about that kind of music.
| A．couldn’t | B．mustn’t | C．shouldn’t | D．oughtn’t |