(58)___

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

50.What does the underlined word "seat”in the last paragraph most probably mean?

• A、Focus.

• B、Position.

• C、Chair.

• D、Center.