Seldom ________ TV when he studied in senior high school.
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.-- ______.
— We usually go hiking for vacation.I like it,but I want to try something more challenging this year.— ________