Someteenagerstheirhealthbecaus

Some teenagers _______ their health because they often expose themselves to so many electric products.

A．have damaged

B．are damaging

C．damaged

D．will damage

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21. Mr Zhang is mild in character. He never shouts ____ he is very angry.

A．if

B．even

C．though

D．even when

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20. John shut everybody out of the kitchen _______ he could prepare his grand surprise for the party.

A．which

B．when

C．so that

D．as if

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19. _______ rich one may be there is always something one wants.

A．whatever

B．Whenever

C．however

D．Wherever

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18. _______ I can see, there is only one possible way to keep away from the danger.

A．As long as

B．As far as

C．Just as

D．Even if

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17. ________ the grandparents love the children, they are strict with them.

A．While

B．As

C．Since

D．Because

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