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INTERMEDIATE LEVEL
Content
gorilla ☊ 
khỉ đột ☊
→ → →
like: khỉ đột → →
As we get older, our bodies become less efficient at burning up calories. ☊ efficient ☊
gas fields ☊ field ☊
gas central heating ☊ gas ☊
The house has gas-fired central heating. ☊ have ☊
a gas heating system ☊ heating ☊