英语大虾进!同义句改写Mr Wang is our maths teather.He is our good frien

英语大虾进!
同义句改写
Mr Wang is our maths teather.He is our good friend,too.
Mr Wang ( )( ）our maths teather（ ）（ ）our good friend.
( ）it was,he never gave up.
A.How hard B.No matter how hard C.No matter how
D.No matter hard
说明个词组的意思以及句子的意思）
改病句：We (can't) (live) (without) air (or) water.
(只能改括号中的词语的其中一个）