The two sisters are twins,so it is difficult for me to ________ them apart.
Ah,it was the place_______we once dug the reservoir.
_______know the truth about it will tell you.
Even with the guide leading the way,they_______to cross the thick forest.
—Do you think he will do me a favor?—As far as I know,he is the last one to help others.He_______be prepared to give you a hand,though.
—Anything I can do for you,Madam?—I’d like_______eggs and some cabbages.