21. Can you believe that in a rich country there should be many poor people?
A. such; such B. so; so C. so; such D. such; so
22. The patient has . I think he’s dying.
A. trouble breathing B. troubles in breathing C. trouble to breathe D. troubles to breathe
23.— What do you think made him so upset?
— I think it was ___________.
A. because of losing his bike B. he lost his bike C. because he lost his bike D. losing his bike
