She did what she could _______ us. Though 3,000 dollars is a lot of money for her.
选字填空。
已 以
____后 ____经 可____ ____为
壮 状
____实 强____ 形____ 告____
蓝 篮
____球 ____天 竹____ ____色
关于法定义务和道德义务,下列说法正确的是( )