Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet.
_______, people injured in the earthquake are _______.
Some scientists think there are _______ 2,000 million flashes of lightning per year.
Whenever we are in ______ trouble, we should never lose______ heart.
We all know that, __________, the situation will get worse.
—Can I join the club, Dad? —You can when you _____ a bit older.