--- Mum, I think I’m well enough to go to school.--- Not really, my dear. You’d better stay at home for _____ day
---What does “too young to do” mean? --- It means “_____ to do”.
--- Hello! Is that Tom over there? Long time no see. Let’s say hello to him. ---Please _____ in the library.
---Mum, where did you put my sweater? ---Is it _____ black one? I put it in _____orange box near your desk.
---Why didn’t you enjoy the talk? ---It was ___talk that I had ever listened to.
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.