You _________to the meeting yesterday. What was the reason for your absence?
Many experts hold the view _______ protection awareness is _______ the key to better environment lies.
During the dialogue with Chinese youth in Shanghai, President Obama announced the U.S. would expand the number of students to study in China to 100,000 _______ ties between the two countries.
—— The experiment is of particular importance.—— I see. We won’t carry on with it _______ we can get the good equipment.
The Internet and the effect _______ brought about did a lot of good to our daily life and work.
Everybody went to the opening ceremony of the film festival——_______ Francisco, who has no interest in anything but sports.