_____to nuclear radiation, even for a short time , may produce variants(变异体) of genes in human bodies.
—Do you feel like ______ there or shall we take a bus? —I’d like to walk but since there isn’t much time left, I’d rather we _____ a taxi.
It was in the small house ___ was built with stones by his father ____ he spent his childhood.
He made a mistake,but then he corrected it ________ the situation got worse.
After the long journey, the three of them went back home,__________________.
How I wish every family _______ a large house with a beautiful garden!