The light bulb ______ by Edison in the middle of the 1780s.
A．is invented B．was invented C．invented D．invent
The old scientist has made a great contribution the moon.
A．in explore B．to explore C．explore D．to exploring
—What is the table made _______?
—Wood.
A．by B．in C．of D．from
Many countries have a lot of rockets into space.
A．sent B．spent C．flown D．made
—How can I learn English well?
—You will learn it well ________ you practice speaking it often.
A．unless B．as for C．as soon as D．as long as
—Are you ready to leave, Helen?
—_________
—I was just asking if you’re ready to leave.
A．Don’t be shy. B．I beg your pardon? C．I’m afraid not. D．I hope so.
