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77. We must not buy things made of ivory and save trees.
79. Tom has to get up early to catch the bus.
或：Tom has to get up to catch the early bus.
80. It takes us 10 minutes to get to school every morning.
77. We must not buy things made of ivory and save trees.
79. Tom has to get up early to catch the bus.
或：Tom has to get up to catch the early bus.
80. It takes us 10 minutes to get to school every morning.
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第1个回答 2014-04-21
We must save trees and not buy made of ivory things.追答
Tom has to get up early to catch the bus.