colder than________.

China is developing rapidly. —Yes, to make our country more prosperous, we should firmly the principle of scientific development. [ ]

He is very aware of what topics he should and should not____________at the conference.

My family plan ____ to Hainan for our this winter holiday.

Do you know where David is? I couldn’t find him anywhere. – Well. He _____ have gone far — his glasses are still here.