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
--- Haven’t seen you for ages! Where have you been, anywhere ?
-- I _______ to New York City. I just got back.
A．have been sent B．was sent C．had been sending D．would be sent
