This kind of plant is ______ to the changes of the temperature. So you should keep it from freezing.
As we the big crowd, I got from my family.
The teacher requested that they _____their homework on time.
I can’t connect my computer to the Internet. There must be ________ wrong with it.
Work hard at your lessons, ______ you’ll fail the exams again.
We’ll never forget the days ______ we lived in the country.