根据各题后括号内的要求完成下列各题，每空一词（含缩略形式）（共10个空，每空1分，共10分）
They often visit the zoo.(用now改写句子)    They_______ ________the zoo now.
Don’t make any noise in the library. (改为同义句)                   in the library.
David can speak Chinese. (对画线部分提问)               can David        ?
My sister always gets up at 7 o’clock in the morning.(改为否定句)
My sister                 up at 7 o’clock in the morning.
They usually go there on a train.(改为同义句)
They usually         a train         go there.