﹣﹣﹣I think it's difficult to write the book report in two days.I really don't know ______ .
﹣﹣﹣Plan your time properly,and you can make it.( )
why I have to do it
when will I finish it
how I can do it
if can I finish it
This question sounds _____ than that one.
Health is very _____and every student knows the _____of keeping healthy.
Our country _______ a lot in the last fifty years.
She said she had some trouble ___________ her homework.
---Is the notebook Carla’s?---It _____be hers. It has Mary’s name on the cover.