—They ______.
A:play football
B:playing football
C:are playing football.
1872年在上海创办的最著名的中文报纸是( )
洋葱根尖细胞进行分裂时,一个细胞连续分裂了四次后,细胞的个数是( )
—It's really difficult to make my dream come true.
— That's true. But you'll succeed if you stick with it.
—About half an hour.