问题描述：
1.When ___ the first man made satellite ___(send) up into space?
1.When ___ the first man made satellite ___(send) up into space?
2.She ___(help) him with his homework yesterday.
3.John ___(hear) to go upstairs two hours ago.
4.___ paper ___(make) of wood?
1.When ___ the first man made satellite ___(send) up into space?
2.She ___(help) him with his homework yesterday.
3.John ___(hear) to go upstairs two hours ago.
4.___ paper ___(make) of wood?
问题解答：
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