Listening Comprehension: Are the sentences true, false, or not stated? ()Alzheimer's disease is currently the biggest health problem among old people in America.

()By the middle of this century, there will be twice as many Alzheimer's patients as now.

()Kenneth's family did not know his grandfather had Alzheimer's until he got lost.

()His grandfather's illness has gotten worse in the last two years.

()Kenneth was worried about both his grandfather and his aunt.

()Kenneth's invention involves sending a signal from a sock to a smartphone.

()Kenneth wanted his grandfather to be able to sleep better.

Please hel