. Knowledge of English is a must in international trade.
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.
—How about going for a picnic this weekend? — Why not? _________.
I can’t remember the day ______ we first met in China.
The boy ________ the father worked in the USA is Jack.