This river forms a natural _______ between China and Korea.

This boy was _______ for what he had done in the class.

Some states in the United States _______ people tocarry guns.

When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.

After working for twenty hours without any rest, the doctors were _______.

We won ’t allow any foreign country to _______ in our internal affairs.

He always has a lot of _______ ideas in his mind , and sometimes we do not even know what he is thinding about.

Much of the news provided by this newspaper is_______, not foreign.

With the _______of Mary, all the girl students are eager to go to the party.

Carelessness made him fall in his job _______.