The school bag ________ be Lucy's, but I'm not sure about it.
A.must B.might C.would D.can't
—Helen, do you know if Martin _______ to my party next week?
—I think he will come if he ______ free.
A.will come; will be B.will come; is
C.come; is D.comes; will be
— Do you know some robots are able to take care of children?
— Really? ________ interesting it is!
A.What B.What an C.How D.How an
My grandfather's hobby is collecting stamps. He ________ them for over forty years.
A.collect B.collects C.is collecting D.has collected
Planting more trees on the sides of the road ________ a good way to make our city more beautiful.
A.is B.are C.was D.were
Tom, hurry up! It's time to have ________ breakfast. The school bus is coming soon!
A.a B.an C.the D./
