We have to stay at home_____ the bad weather.

The greatest love in the world is no doubt the love of a mother; it can be _____ by nothing else.

Luckily, we’d brought a road map without ______ we would have lost our way.

I felt it hard to keep up with my classmates. But whenever I want to_ _, my teacher always encourages me to work harder.

How _____ you say that you really understand the whole story if you have covered only part of the article?