I know the girl _____ is singing over there. She is my classmate, Lily.
A.whose B.who C.whom
—When will we begin our trip?
—We'll set out _____our teacher arrives.
A.as soon as B.so long as C.as far as
—The summer vacation is coming. Are you going to have a part-time job?
—Yes. I think I shouldn't always _____my parents.
A.look for B.look after C.depend on
The number of people in the city _____ about seven million now.
A.is B.was C.are
Look at the trees on both sides of the street. They _____ last spring.
A.planted B.are planted C.were planted
—Can you come to my birthday party on Sunday, Mike?
—Sorry, I_____. I have to look after my little sister.
A.can’t B.may C.mustn’t
