( ) 16. Look! Is it_______ UFO or_______ plane in the sky?
A. an; a B. a; a C. the; the D. an; an
( ) 17.How much does it ________ to fly from Guangzhou to Hainan?
A. cost B. pay C. spend D. take
( )18. You _______afraid of doing homework. You know, it’s easy. Just be careful.
A. don’t have to B. have to be C. don’t have D. don’t have to be
( )19. Chairman (主席) Xi asks us ________strict economy (厉行节约) in our daily life.
