1．—What do you want to be in the future, Lucy?
—I want to be _____ pilot. It is _____exciting job.
A. a; a B. a; an C. a; the D. the; an
2．Mary was born in 1998 and she began to play _______ guitar at the age of seven.
A.a B.不填 C.the
3．My sister likes playing_____guitar and she also likes playing______soccer.
A. the; the B. /; / C. /; the D. the; /
4．Do you know a spaceship flies at about nineteen kilometers ________ second?
A. the B. a C. / D. an
