Scientists are trying to ways to treat the terrible disease called H7N9.
-How well she sings! -Yes, she has a very sweet __________.
He found very difficultthe math problem.
My sister has learnt English _________.
—Did Tom’s parents go to the meeting yesterday? —Yes,of them did, butspoke.
Kate doesn’t want to buy the skirt because ____the color ______ the size fits her.