一．单项选择（共15小题，计15分）
( ) 1. ______ UFO landed on Center Park and ________ alien got out of ________ UFO.
A. An; an; the B. A; an; the C. A; a; a D. A; an; a
( ) 2. An alien landed ____ the earth ____ Monday morning.
A. in , in B .on, on C. in, on D. on, in
( ) 3. .Would you please drive faster? My flight is ________.
A. taking off B. getting off C. turning off D. putting off
