[单选题] ______ you talk to someone or write a message，you show your skills to others.

1、[单选题]When I try to understand ________ that prevents so many Americans from being as happy as one might expect,it seems to me that there are two causes.

• A、why it does
• B、what it does
• C、what it is
• D、why it is

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2、[单选题]I carry only enough money to make change for a ______ bill.

• A、tens-dollar
• B、ten-dollar
• C、ten-dollars
• D、tens-dollars

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3、[单选题]The residents,________ had been damaged by the flood,were given help by the Red Cross.

• A、all their homes
• B、all whose homes
• C、all of whose homes
• D、all of their homes

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4、[单选题]Mother was out.I ______ look after my little brother.

• A、have to
• B、mustn’t
• C、need
• D、had to

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5、[单选题]Although he knew little about the large amount of work done in the field,he succeeded ________ other more well-informed experimenters failed.

• A、which
• B、that
• C、what
• D、where

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