________ we are high school students, we should try our best to work hard．

A．Even if

B．As though

C．In case

D．Now that

Henry had just given himself for lost ________ he was spotted by a ship．

A．when

B．while

C．as

D．after

The police told him not to leave the city without ________．

A．prevention

B．permission

C．prediction

D．pollution

This is a valuable dictionary．You ________ look after it carefully and you ________ lose it．

A．will, can't

B．should, won't

C．must, mustn't

D．must, may not

Is it in the concert hall ________ we often have a meeting that the coming teacher-parent meeting will be held?

A．that

B．which

C．where

D．when

Even ________ various circumstances in life and ________ with detailed trouble in the research work of hi-tech, Steven Jobs never blew his waist to any difficulties and finally accomplished his own Kingdom．

A．facing, faced

B．faced, facing

C．to face, faced

D．faced, to faced

Some western countries are still determined to interference(干涉)the completed conflict between Syria government and the rebel ________ millions of people are against it across the world．

A．as

B．since

C．however

D．although

She'll never forget her stay there ________ she found her son who had gone missing two years before．

A．that

B．which

C．where

D．when

We will discuss the question that he ________ at the meeting．

A．came up

B．brought up

C．put up

D．fed up

I hadn't seen him for 10 years but I ________ him at first sight．

A．realized

B．spotted

C．watched

D．observed