On account of fuel supplies being finite and many people being wasteful, we will have to install ________ solar heating device in our home.
| A．some type of a | B．some types of a | C．some type of | D．some types of |
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He enjoyed great success in the business, but his health _____as a result of years of hard work.
| A．broke down | B．broke out | C．broke off | D．broke away |
In London, people always take an umbrella with them_____it rains.
| A．so that | B．in case | C．as if | D．even though |
He stayed up late last night,_______for the exam that would take place next week.
A．prep ared |
B．preparing | C．to prepare | D．and preparing |
Mount Wutai,_____we visited last month,attracts hundreds of thsousands of vistors every year.
| A．where | B．which | C．what | D．as |
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