根据问句选出答句，将序号填在括号里。 (10分)
( ) He _____ from US. A. come B. go C. comes
( ) I _____ twelve . A. am B. is C. was
（）Let’s ____ our class ! A. to begin B. begin C. begin to
（）Go ____ to your seats . A. from B. in C. back
（）I come _____ Britain . A. to B. at C. from
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