If you are going to stay in the United States for longer than a(n) ______ visit, you may be interested in learning more about its people and culture.
What he said,_____, has nothing to do with what he did.
—— There will be a storm soon. —— I am afrai?_____.
_____ heat is different from temperature?
_____ his face, the young man must be over 20.
_____ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge.