Complete the second sentence so that it has the same meaning as the first one

III.Complete the second sentence so that it has the same meaning as the first one.
 
15.Joana doesn’t eat much in order not to be overweight.
Joana doesn’t eat much because ……………………………………………………………..
16.It’s a good idea to do exercise regularly.
You ………………………………………………………………………………………………..
17.Cycling is faster than walking .(as)
Walking ……………………………………………………………………………………………