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3. __________
…
Disadvantages
1. __________
2. __________
3. __________
…
Word formation
useless adj.
use v.
→
useful adj.
careless adj.
care v.
→
careful adj.
helpless adj.
help v.
→
helpful adj.
She is wearing a _______.
helmet
Do you think it necessary for a bike rider to wear a helmet?
What does she use it for?
Listen to 1a and complete the sentences.
We should never ride ______ _____.
We should wear bicycle ________ when riding.
We should have _______ on the bike or wear _____________ clothes while riding at night.
We should learn more about the ______ ______.
1b