GMAT: Sentence Correction

Question 1

ABILITY

Answer 1

R: I value my ABILITY TO sing.W: I value my ABILITY OF/ABILITY FOR singing.W: I value the ABILITY FOR me TO SING.

Question 2

ACT

Answer 2

The bay ACTED AS a funnel for the tide (=functioned as)My friend ACTED LIKE a fool (=behaved in a similar manner)