— Hi, Jack, would you like to join us in the sightseeing this weekend?—Thank you, but I regret ______ you that I can’t, for I’m going to visit my grandparents.
It was ________ she got home ________ she found her diamond necklace missing.
While watching television, _______________________.
_______ by greater demand of vegetables, farmers have built more green houses.
________ they become dirty, the lakes are not able to clean themselves
I think he is ________ to win, but I’m not sure.