Thisproblemmayleadtomoreseriou

This problem may lead to more serious ones if _______ unsolved.

A．making

B．remained

C．keeping

D．left

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--Li Ping often watches _______ English TV news in her spare time.
---No wonder she has _______ command of English.

A．/; a

B．an; the

C．the; /

D．an; a

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Our English teacher is wearing a gold watch, ________are made of small diamonds

A．whose the hands

B．of which hands

C．the hands of which

D．the hands of whom

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__________at the door before you enter the office，or you’ll be considered impolite

A．Knocking

B．Knocked

C．Knock

D．To knock

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It was March 14th．2013__________Xi Jin ping was elected chairman of the People’s Republic of China

A．in which

B．that

C．until

D．when

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Camacho，the former Chinese football coach，__________ in China between 2011 and 2013

A．have worked

B．worked

C．had worked

D．works

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