She would love to have gone to the party, but she _______ extra hours to prepare for a meeting.
| A．had to work | B．had worked |
| C．could work | D．would have worked |
—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 |
．—Why are the housing prices in big cities going up all the time?
—One reason is that people are________into overcrowded cities in great numbers.
| A．breaking | B．filling | C．pouring | D．hurrying |