______ is necessary _______ us ________learn English well.
| A．It, of, to | B．This, of, of | C．It, for, to | D．This, for, to |
Look at the photos ____ I took in the Yellowstone National Park.
| A．what | B．that | C．where | D．whose |
I’ll see to your cat when you aren’t in ? What does the underlined phrase mean ?
| A．look after | B．take care | C．look at | D．look for |
----______is the population of your city?-----About two million.
| A．How many | B．How much | C．What | D．Which |
Please open a window _________ turning on air conditioning.
| A．instead of | B．instead | C．not | D．rather |
In those days ,books could only be produced one at a time _____________.
| A．in hand | B．with hand | C．by hand | D．by hands |