-What are on show in the museum? -Some photos _____by the children of Yushu, Qinghai.
Since we have a new friend here, why not ____ a party _____ next week?
Tom looks ________, for he hardly ever exercises ____ his free time.
--________ does your father visit your grandparents a week? –Once.
--________ do you have PE? –Every Monday, Wednesday and Friday.
We have to work for ________ to finish the work.