Six and six is ________.[ ]
A. eleven
B. twelve
C. thirteen
答案：B
---- How much does it _______ to fly from Beijing to Haikou one-way?
---About 1000 yuan.
A．cost
B．pay
C．spend
D．take
His subject is ______. [ ]
A. swims
B. swim
C. swiming
D. swimming
