You think that growing trees is a waste of time.
It is a waste of time ( ) that again
they think it is a waste of time to do it now能不能改成they think
You will never think it a waste of time.You start the course
It is only a waste of time
I think watching TV is a waste of time .这里watch为什么要加ing?
waste——that is a waste of money
I think what you are doing is _______(waste) time.
a waste of time
适当形式填空Stop doing that!It is a waste of time and ____________
is,talking with,of,her,waste,time ,a,it,
it is a waste of time to do 这个句子
a,reading,time,cartoon,really,waste,books,is,of(.)