Some states in the United States _______ people tocarry guns.

Carelessness made him fall in his job _______.

Without a proper education, people could _______ all kinds of crimes.

Sometimes it is very difficult to _______ some of the English words. Even the native speaker can not help.

Several loudspeakers are _______ from the ceiling and we can hear the speaker very clearly.

This morning in the class, our teacher lost his ______at last because he could not stand any more.

It is not ---_______ for me to return all the books to the library now because I still need some of them for my research.

Students with _______ problems may apply for student loans.

When traveling alone in the mountains, you ’d better take a _______ with you in case you get lost.

As a teacher, you should not _______ the students from asking questions in class.