The road is always busy. Look out when you walk_______.
We can go hiking next week ____ it rains heavily.
–Look at the woman, why does she look so tired? --Because she has three babies to ____.
There are so many good books. I really don’t know ____ .
Our English class is so ____ that all of us are _____ in it.
The students should ________ to choose their own clothes. It will be a good way _____ themselves happy.