Đáp án:
`49.` Different kinds of flowers are planted in the garden by her father.
`50.` An article is translated from English into Vietnamese.
`51.` A speech was made by the Prime Minister yesterday.
`52.` A safety pin was swallowed .
`53.` I was followed .
`54.` One of my teeth was pulled by the doctor yesterday morning.
`56.` A new suit was made for me by the tailor .
`57.` He was seen pick up the gun.
`-` Cấu trúc câu bị động:
`+` Thì Hiện tại đơn: S + am/is/are (not) + PII + (by o)..
`+` Thì Quá Khứ Đơn: S + was/were (not) + PII + (by o)..
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