This river forms a natural _______ between China and Korea

He _______ to study harder in the future so that he could have more opportunities to find a better job

The _______ work continued for more than a week but there was still no sign of the missing boy.

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

He tried to _______relations with his former wife but he failed

We are _______ at the rapid progress Mark has made in this semester.

She is already 16years old But she _______as if she were still a little girl.

The doctors _______ the medicines to the people in the flood area

In order to increase our output, we need to import more production _______.

This river forms a natural _______ between China and Korea

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