牛津英语的问题,希望有大虾们回答,

牛津英语的问题,希望有大虾们回答,
1 When we saw an old photo ,it made us ________ our childhood
A think of
B think about
C think over
D think out
2 Both my sister and l have been to the Great Wall .(改文同义句)
My sister _____ _______ ________ l ________ been to the Great Wall.