Scientists are convinced ___________ the positive effect of laughter ___________ physical and mental health.
— Jack, this is the third time that you have been late this week. — Sorry, sir, but I was ______ for 15 minutes on the way here in the traffic jam.
Without that conversation between them, they would ______ be able to avoid mistakes.
The zoologist is telling the visitors how a horse’s vision differs from ______ of a human.
This book will show the readers ______ can be used in other contexts.
According to a study carried out by an American university, when you eat has ______ on your mood as ______ you eat.