Perugia is an old city _______ narrow, steep streets do not make existing methods efficient.
A. which
B. that
C. whose
D. who
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This study suggested that the system _______ the cost of building it within seven years.
A. would repay
B. repays
C. repay
D. repaying
China might benefit _______ this new system.
A. to
B. for
C. with
D. from
His team is now working with researchers at Tongji University in China who are _______ tying Pipenet there.
A. interesting with
B. interesting in
C. interested with
D. interested in
Translate the underlined part in the sentence "Africa ignored fixed-line telephones and jumped straight to mobiles."
A. 安装电话线
B. 修理电话线路
C. 固定电话
D. 移动电话