Keeping fit and healthy may seem difficult,but there are a few easy-to-follow guidelines.Firstly,a balanced diet (26) ________ means selecting food that is low in salt and sugar is absolutely essential.Experts recommend reducing the amount of far (27) ____________ our diet,as too much can cause heart problems.Secondly,it is important to fit exercise into our daily (28) __________.This can be done by simply walking as much as possible and climbing stairs instead of taking the lift.Exercise is necessary to maintain (29) __________ healthy body,as well as increasing energy levels and making you feel generally fitter and happier.Finally,staying relaxed is another reason for good health.Too (30) _______________ stress can lead to a variety of illnesses,from headaches to high blood pressure.Whenever possible,do thing you enjoy and treat yourself occasionally.

`26:` A.who   B.when   C.whose   D.which

`27:` A.on      B.in   C.at   D.x

`28:` A.time    B.custom  C.routine   D.manner

`29:` A.a        B.an   C.the   D.x

`30:` A.few    B.little   C.many  D.much