1.I won't speak to him u_____ he speaks to me first.
2.I don't think we should do it.It is a waste of time and e_____.
3.It's very hard to keep one's b____ on the icy croads.
4.Jay is very busy at the m_____.You can come to see him an hour later.
1. unless 除非
2. energy 精力
3. balance 平衡
4. moment 时刻 at the moment 现在
2. energy 精力
3. balance 平衡
4. moment 时刻 at the moment 现在
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