Everybody has _____ responsibility to save water, if future generations are to enjoy ____ similar standard of living to the one we enjoy now.
.__________,we must believe in ourselves and believe that we can do something well.
In 1800s, a group of adventurers(探险家) ______ on their exploring trip. Five days later, they came to what is now known as Quebec.
---It’s said that no one ______ light a cigarette at a gas station. --- Yes. Safety always comes the first.
I don’t know ______ or not the books _____ to the homeless children next month are really useful.
.—I failed again in the math test. -- ______.