1．Production in the factories stopped because of frequent (频繁的)power failures.
2．You can always tell the difference between the tourists and natives (当地人)．
3．A dead body was found under the bridge，but it was hard to determine the identity (身份)．
4．If you want to read quickly and well，you should increase your vocabulary (词汇)．
5．Parents noticed the gradual (逐渐的)change in their children.
