-There ______ many trees at the foot of the mountain.--But now they are slowly disappearing because of human activities.A.is used toB.used toC.used to be
---_______ her father work? --- In a restaurant.
There is usually ________ in summer in Yangzhou, it helps crops(庄稼) grow well.
He likes going into town________ his father’s car.
Can you show me ____ pen? This one is too expensive.
Which of the following can’t we use when we make a telephone call?