( )The U.K.’s flag is ________.
A. white B. red and white C. red，white and blue
Most everything in this world ____________ air and sunlight.
A. need
B. needs
C. needes
Most trees lose their ____________ leaves in fall.
A. green
B. yellow
C. red
Do you know the name ____________ each part?
A. for
B. of
C. at
Please write ____________ down.
A. they
B. its
C. it
选择正确的一项，补全单词。
__ fter
A. o
B. e
C. a