【单选题】
若f(t)=t^3+1,则f(t^3+1)= ( )
【单选题】
Take out accident( )before you travel.
【单选题】
Please show your( ) card before entering.
【单选题】
Dont forget ____ the window before leaving the room.
【判断题】
Before the conjunctive adverbs there should be a semicolon, not a comma.
【单选题】
Please ______ you cigar before entering this building.
【单选题】
She ________ the door before she goes away.
【单选题】
_________hand in his exercise-book before Monday?
【单选题】
She ___ the door before she goes away.
【单选题】
He _______ working before 6 o’clock.