multiple choice about compound and complex sentences

[Vega]

I'm not a teacher, nor a native Englishman. But I think the correct answers should be:

1. D
2. B
3. B

Are they correct?

[trungkienb]

1.Is this museum_____they visited last week?
A.where B.that C.in which D.the one
2.The sun is bigger than the moon,____,we all know it.
A.and B as C.which D.that
3.He failed in the exam again,____was not what he had expected.
A.that B.which C.when D.as

I think
1 A
2 A
3 B

[Vega]

1.Is this museum_____they visited last week?
A.where B.that C.in which D.the one
2.The sun is bigger than the moon,____,we all know it.
A.and B as C.which D.that
3.He failed in the exam again,____was not what he had expected.
A.that B.which C.when D.as

I think
1 A
2 A
3 B

If there wasn't commas in the 2nd sentence I would paste as, I didn't notice commas. :?

I disagree with the 1st sentence. To me, C sounds better: Is this museum the one they visited last week?

:?