1．(2018·全国卷Ⅰ)To avoid knee pain, you can run on soft surfaces, do exercises to ________(strength) your leg muscles, avoid hills and get good running shoes.
[答案] strengthen
2．(2018·全国卷Ⅱ)When ________(combine) with berries or slices of other fruits, frozen bananas make an excellent base for thick, cooling fruits shakes and low fat “ice cream”．
[答案] combined
3．(2018·全国卷Ⅱ)Working out in the morning provides additional ________(benefit) beyond being physically fit.
[答案] benefits
4．(2017·北京卷)The magazine also explores philosophy and wellbeing to make sure young readers have a ________(balance) take on life.
[答案] balanced
