Anyone, once _______ positive for H7N9 flu virus, will receive free medical treatment from our government.
| A.to be tested | B.being tested | C.tested | D.to test | 
 20. His sister left home in 1998, and______since.
| A.had not been heard of | B.has not been heard of | 
| C.had not heard of | D.has not heard of | 
 19. He has made a lot of films, but___________good ones..
| A.any | B.some | C.few | D.Many | 
 18. I can' t leave. She told me, that I_____stay here until, she comes back.
| A.can | B.must | C.will | D.May | 
 17. —Have you heard the latest news?
  —No, What______?
 A
. is it B. is there C. am. they D. are those
 16. My friend showed me round the, town,_____________was very kind of him.
| A.which | B.that | C.where | D.It |