10755 - Part D (Page 179) Test:15 - ______ is that there is a risk of heart attack for the elderly.

______ is that there is a risk of heart attack for the elderly.
One important drawback of aerobics
If there is one important drawback of aerobics.
There is one important drawback of aerobics
It is one important drawback of aerobics
Upper-Intermediate Grammar Exercises
English Vocabulary Tests
Pre-Intermediate Grammar Exercises
English Worksheets