— Jack, take more clothes when going camping. It ______ be very cold in the mountains.— Thank you, Mum. I will.
--- Hello! Is Mr. John in the office?--- Yes. But I’m sorry. He is busy _________ and can’t speak to you.
As a young man, there was __________ time __________ I hated to go to school .
—I am leaving for the States tomorrow, Caroline!—______
As we all know, many Chinese words have come into English, _____ typhoon, tofu and kung fu.
If better use is _______ of your spare time, you’ll make great progress in your study.