A:corrected
B:was correcting
C:had corrected
D:would correct
我国普通家用电冰箱的电源电压是____ 伏,它与其它家用电器应____ 联,电冰箱制冷时,电能转化为____ 能.
China is seeing ______ growing trend in the number of people owning pets and ______ recent survey finds that one in 13 Chinese now keep animals.