A. compare to B. grind C. eighty D. keeper A. on business B. in a word C. far D. homestay A. train B. leaf C. protect from D. son A. aspirin B. free of charge C. car D. crust A. insurmountable B. every C. motivation D. persecute A. pop B. thermodynamics C. by bike D. deposit A. consider B. ride C. Big Ben D. horsepower A. village B. slippery C. ought to D. if A. handwriting B. upper C. alarm D. subway A. everywhere B. year C. on one's mind D. summer