______ the sound on the step, the boy rushed out to see if his mother had come back.
In recent years, great changes have taken place in the city of Wenzhou. As we can see, many streets and roads_______.
Seeing the policeman, the thief was behaving __________ nothing had happened.
Tom, you ________ leave all your clothes on the floor like this next time.
Although they are twin sisters, they have nothing__________.
He is wearing sunglasses to ____ his eyes from the strong sunlight .