单项选择题

By the middle of the 21st century, the vast majority of the world's population ______ in cities rather than in the country.

A. are living
B. will be living
C. have lived
D. will have lived

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单项选择题

______ we have all the materials ready, we should begin the new task at once.

A. Since that
B. Since now
C. By now
D. Now that

单项选择题

Several experts have been called in to plan __ for boating, tennis, refreshments and children's games in the projected town park.

A. equipment
B. instruments
C. implement
D. facilities

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