16．There is_______“k”and______“f'”in the word“knife”．
A．a；a B．an；an C．an；a D．a；an
17．Kate，with her parents，________to the park on Sundays．
A．go B．goes C．going D．are going
18．The blue jeans are too short．Do you have a long________?
A．one B．ones C．pair D．pairs．
19．There_________a pear and two apples on the table．
A．has B．are C．is D．have
20．—When's Christmas Day?
一It’s _______December 25th．But people usually celebrate it______the evening of December 24th．
A．On；on B．On；in C．／；on D．in：in
21．—_______Daniel from Nanjing?
