题目内容

The _________ of our production means we have cheap products.

A. efficiency
B. affection
C. effect
D. affect

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In 2017 the exchange rate of the currency _________ 7.49 for a dollar.

A. drop down
B. dropped to
C. drop to
D. dropped down

To get all the _________ necessary to become an electrician, you have to go to college for three years.

A. qualified
B. qualifying
C. qualify
D. qualifications

If your parents are _________ what you want to do, it is always a lot easier.

A. support with
B. supportive in
C. supportive with
D. support in

Security cameras have been _________ in the city center.

A. installing
B. to install
C. installed
D. to be installed