Students need at least eight hours to sleep, or they are_______ in class.

Jim is eight-year-old boy. He spends half _____hour playing _____ piano every day.

Miss Li, where did you visit last week?— I visited a big company __________ ships are made.

Jamie is a young cook _____ wants to improve school dinners. [ ]

Email is very popular today. People ______write letters to each other now.