Pop music is such an important part of society______ it has even influenced our language.
| A．as | B．that | C．which | D．where |
Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.
| A．being used | B．used | C．to be used | D．having been used |
A new __________to teaching English, is being used here, and it has proven to be very helpful to the students.
| A．way | B．system | C．approach | D．method |
It was at the very beginning _______ Mr. Fox made the decision _____ we should send more fire-fighters there.
| A．when, which | B．where, that | C．that, that | D．then, so |
Last Sunday I went to visit the History Museum where I saw a pot _________ about 1,000 years before.
| A．so it had been | B．so had it been | C．what it had been | D．as it had been |
The reason why this kind of machine is popular with users is that it will work in ______ temperature.
| A．official | B．extreme | C．common | D．natural |