18. keep sb.doing sth. 让某人一直干某事 keep doing sth. 继续做某事
keep on doing
sth. 持续不断地做某事
19. much too+形容词/副词原级 实在太...
too much+不可数名词 相当多的... eg. It's _______
expensive. I can't buy it.
There's ___________ rain this year.
20. thanks to...由于,多亏
thanks to
one's help=because of one's help 由于某人的帮忙 thanks for one's help 谢谢某人的帮助