When I went in,he was lying on the floor ___ at the ceiling.

When I went in,he was lying on the floor ___ at the ceiling.
A.to stare B.stared C.was staring D.staring
2.I want to make ___ clear that we should do an important and necessary job.
A.that B.this C.it D.what
3.That's ___ I was born and grew up.
A.there B.where C.in which D.the place
4.Some college students are seen doing ___ work they can find to support themselves.
A.that B.which C.no matter what D.whatever
5.The reporter asked the gentleman why he ___ in such a simple way.
A.was dressed B.wore C.put on D.had on