帮我造句,每个词组一句：1.by no means 2.at fault 3.at a time 4.be bound

1.She si by no means a good singer
她绝对不是一个好歌手
2.Who was at fault in the accident?
这次事故是谁的过错?
3.Let your listener answer one question at a time.
让你的听众一次回答一个问题.
4.I will still be bound to support him,he will not be a thing of the past.
我仍然会义无反顾的支持他,他不会成为往事.
5.A referee must commit the rules to memory.
裁判员必须把规则背熟.