climbing hills ____of great help to our health A.was B.were

climbing hills ____of great help to our health A.was B.were Climbing hills is of great help to our health.为什么用of? Climbing hills _ of great help to health. climbing hills ___of great help to out health Climbing skills ___good for our health A is B are Our class -------to help others.A was asked B were asked Mountain climbing is a very good sport.It is( )our health,to 英译中：You were a great help to us. we were all t_ after climbing the hills __________________(they,come)to help was a great encourageme Sports are good ____ our health. A.to B.for climbing m____ is good for our health.