`I)`
`15` . My friend has been met by me at the beach.
`16` . I was given a pen by her teacher last month.
`17` . The floor is often swept by her every morning.
`18` . The exercise can't be done.
`19` . He was known to have stolen the car.
`20` .The questions is too difficult to be answered.
`21` . He will be able to be met by her.
`22` . The family is going to be visited by him.
`23` . The room must be swept by you everyday.
`24` . English has to be learnt every night.
`25` . Plumbing at the village must be improved
`26` . Vegetables are going to be grown in the garden by him.
`27` . Coffee used to be drunk by her at night.
`28` . Cows can be raised at Duc Linh
`29` . Has she ever been met by you ?
`30` . By whom can the exercises done?
`31` . What is being done?
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