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15.At such a time of crisis, we must try ＿＿ to all differences and stick together,

• A、set aside 

• B、set back

• C、set down

• D、set forth

20.In October 2007,the Chang'e-l satellite was successfully ＿＿at Xichang.

• A、launched

• B、presented

• C、regulated

• D、engaged