He can’t get into (进入)the room. He _____ a key.
The problem is too difficult for him. He solve it.
—Do you consider yourself a rude person? — not. I always have good manners.
________ her great joy, her daughter was finally saved by the doctors.
Stop ______ about the traffic. Just think about what we can do to improve it.
English is useful language. We should learn it well.