giúp em với em cảm ơn

`II.`

`1`. This is the astronaut. He visited our school last week.

=> This is the astronaut who visited our school last week.

`2`. This is the village. Helen Sharman, the first British astronaut, was born there.

=> This is the village where Helen Sharman, the first British astronaut, was born.

`3`. Can you talk more about the parabolic flights. You took them for your training?

=> Can you talk more about the parabolic flights which you took for your training?

`4`. This is the museum. It has some of the best rock collections in the country.

=> This is the museum which has some of the best rock collections in the country.

`5`. We'll explore inland Sweden and visit the summer house. Carin and Ola have built it themselves.

=> We'll explore inland Sweden and visit the summer house which Carin and Ola have built themselves.

`6`. This is the year. The first human walked on the moon on that day.

=> This is the year when the first human walked on the moon on that day.