5、component/element/ factor/ ingredient

　　Tires, the engine, the body, and the seats are ______ of a car.

　　The ______ hydrogen and oxygen combine to form water.

　　Endurance is an important ______ in success in sports.

　　Flour, milk, butter and yeast are some ______ in bread.

　　答案：

　　1. adjusted, regulate, rectified, amended, converted, altered, modify, transformed, vary

　　2. alleviated, diminished, reduced, decreased, declined, declined

　　3. amplify, enlarge, enlarge, stretched, magnify, reinforced, expanded

　　4. compelled, constrained, forced, obliged

　　5. component, element, factor, ingredients