—Are you going to Tom’s birthday party? --- ________. I might have to work.
Everyone has periods in their lives everything seems very hard.
—Do you know Lily has gone to London? —Oh,________I haven't seen her these days.
Jane is an honest girl;I say it,________I don't like her.
Six people were killed in the riot(暴乱),a policeman________.
He tried his best to solve the problem,________difficult it was.