The girl was often heard ______ happily in her room.
A. sing B. to sing C. singing D. sings
The key ____ for opening the door of the room.
A. uses B. is using C. is used D. used
_____ shouldn’t have part-time jobs because they are too young.
A. Thirteen years old B. Thirteen-year-old C. Thirteen-year-olds D. Thirteen year olds
_____ lovely day!
A. What a B. What C. How a D. How
All the new books _______ to the poor village next month.
A .were sent B. will be send C. are sent D. will be sent
No free plastic bag in the supermarket helps to _____ white pollution.
A. reduce B. recycle C. provide D. Produce
