根据图片提示，把句子补充完整。
1．
a. There _______ _______ buses.
b. There _______ lots of buses and cars now.
2．
a. We _______ in a _______ house _______ _______ _______.
b. We _______ in a _______ house now.
3．
a. My father _______ _______ _______ to work many years ago.
b. My father _______ a car to work _______.
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