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I know one of the things I was unsure about was _____ hard it would be to climb this mountain.

A．what             B．that              C．however          D．how

She told me that she would not go with us if it ____ the next day.

A．was raining        B．rains             C．rained            D．had rained

Visitors to the National Museum can avoid long lines at the ticket booths by purchasing tickets ____.

A．in advance        B．in detail           C．out of order       D．with caution

The first few years in the 21st century ______ the rapid rise of China as a world economic power.

A．witness           B．has witnessed      C．will witness        D．have witnessed

He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.

A．a(chǎn)uthority          B．routine           C．privilege          D．boundary

We should _______ whatever is true.

A．keep up          B．settle down        C．stick to           D．team up with

Although he _______ the danger to his own health, he found it difficult to quit smoking.

A．was very aware of   B．well awared of      C．was well aware of   D．very awared of

---Will it be a long time _______ I come for the pictures?

----No. It _______ be ready by 3:00．

A．that; can          B．since; will         C．before; should     D．until; must

Written in a hurry, ________. How can it be satisfactory? 

A．they found many mistakes in the report

B．Sam made lots of mistakes in the report

C．there are plenty of mistakes in the report

D．the report is full of mistakes

Sean’s strong love for his country is           in his recently published poems.

A．tolerated          B．reflected          C．responded        D．contradicted