有几个英语语法填空我不会做,请大家帮帮忙哟

16, he___C___lives in the house where he was born.
A already 已经 用于完成时
B yet 用于否定和疑问句
C still 仍然
D ever 曾经

从lives看出此为一般现在时

17，he is an excellent teacher, who always teaches ____c____ example.
A in
B through
C by
D on

通过例子教学

18, do you know ___b___ in English.
A how say it
B how to say it
C how saying it
D how to saying it

固定句式

19, I fell and hurt myself while I ___a____ football yesterday.
A was playing
B am playing
C play
D played

在昨天(was)踢足球的过程中(ing)受伤

20. we had hardly get into country ____a____ it began to rain.
A when
B before
C then
D after

have hardly done sth when....固定句型

16C17C18B19A20B我英语能考120，起码能对4?题。

C
B
B
A
A
恩，是简单，但我也是刚捡起英语，、
等高手正解

我的理解是这个：CBBAB
比较不确定的是17