[单选题] We tried to ______ our conversation to arguments relevant to the topic.

1、[单选题]By _____ of taxation, we pay for things that we need just as much as we need something to eat.

• A、means
• B、mean
• C、ways
• D、method

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2、[单选题]He didn’t come back _____ it was dark.

• A、until
• B、that
• C、as soon as
• D、where

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3、[单选题]Scientists have (  ) many new methods of increasing the world's food supply.

• A、put up with
• B、caught up with
• C、 brought up with
• D、come up with

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4、[单选题]（　）bad weather stops me, I go for a walk every day.

• A、If
• B、Unless
• C、Lest
• D、In case

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5、[单选题]The current investment _____ in our country are favorable, so a lot of foreign investors have come.

• A、conditions
• B、weather
• C、situation
• D、state

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