Mark the letter A, B, C, or D to complete each of the given sentences.

My grandparents looked ______ my brother when he was small.
1. with
2. at
3. into
4. after
A group of students carried ______ research on Korean culture and cuisine.
1. for
2. out
3. off
4. by
We need to work ______ the high unemployment in our town.
1. out
2. about
3. for
4. up
My friends were looking ______ information about Steve Jobs on the Internet.
1. on
2. from
3. for
4. by