1. The snow started falling at five o'clock; then the wind began to blow hard from the north.
2. The best way to keep warm in icy weather is to wear layers of clothing. Moreover, wool is much warmer than cotton.
3. In their own countries Soviet scientists are no longer needed for nuclear arms development. However, other countries actively seek their skills.
4. Correct
5. The heavy black clouds meant rain; they came on swiftly with thunder and lightning.
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