________of the people on the Net ________China's economy is among the strongest in the world.
He was ______ about his ______ son, who is always skipping classes.
Julie was good at German, French and Russian, all of ______ she spoke fluently.
We narrowly escaped _____in the forest of South America 15 years ago.
Mr. Smith spoke slowly and clearly to _____ all of us students could follow him.
Nancy enjoyed herself so much ______ she visited her friends in Sydney last year.