I often heard Tom _________ the violin in the next room.
—When did you see him? —______.
We go _____ the road and _____ the building, then get to the park.
---Do you know Mark Twain?---Yes .2hHe is a great writer of America. And he ____the name Mark Twain and became famous in the _______a e1教育名师原创作品
Please be careful ______ your study ______ now on.
Tony is only four years old, ______he draws very well.