Multiple choice Directions: Fill in the blank. A drowning man catches ………. a straw. on with at for Reveal answer Fill a bubble to check yourself C Correct answer Explanation The correct idiom is 'catch at a straw', which means to desperately try to grasp something when in trouble. 'Catch on' means to understand, 'catch with' is not used this way, and 'catch for' doesn't fit this context.