Ответ:

2 Madonna, who has won several Grammys, is a famous singer. or

Madonna, who is a famous singer, has won several Grammys.

3 The Prime Minister who will open a new hospital has a very busy agenda. or

The Prime Minister, who has a very busy agenda , will open a new hospital .

4 John, who travels a lot, will come to Paris next week. or

John, who will come to Paris next week, travels a lot.

5 The new museum, which is devoted to Natural Sciences, is located downtown. or

The new museum, which is located downtown,  is devoted to Natural Sciences.

6 Last week this reporter interviewed Obama who was President of USA in the past.

7 The Eiffel tower, which was finished in 1889, is an important monument in France. or

The Eiffel tower, which is an important monument in France, was finished in 1889.

Объяснение:

каждое предложение ( кроме 6го) можно переделать 2мя способами-смотря какое значение вы хотите передать!