---What _____ useful book! And ______ book is popular with students.A. a, a B. a, the C. the , the
---Could you please help me to take these books there?---_____.
_____ he is busy, ______ he helps his parents with the housework on weekends.
I exercise every day, so I am _____ healthy.
Students should study hard to make their dreams .
---Why don’t you want to go to the beach?---Because there is ________ there.