____is hard to protect them better . A.this B.that C.it D.on
He frinds____very hard to srudy English.A.they B.them c.it D
单项选择Who' that at the door?-____is maryA.It B.He C.her D.This
please put___ a.it on b.on them c.them on d.on it
I found ( ) hard to study English.A.that B.it C.it's D.its
Tom found( )hard to learn Chiese well A.that B.it C.this
She thinks ( )wrong to be late.A.that B.it C.she D.them
【英语】____is difficult to study English well.A.That B.It C.The
A.for;protect B.against;protect C.for;to protect D.to The so
We find ______ necessary to protect the earth.A.it B.this C.
It's raining hard.You'd better ___out.A:don't go B:not to go
it's raining hard.You'd better _________ out A:not to go B:t
--- is boring to visit the museum.A.It B.That C.This D.What