Some researchers are finding that daydreaming may beimportant to ______ mental health and it is ______ good means of relaxation

My funny joke made my grandparents ___happy.

Everyone must __________ the security check (安检) before getting on the plane at the airport.— Yes. It’s necessary to ensure the passengers’ safety.

__ behavior allows you to loseweight, make it a part of your life so the weight stays off.

I wish you _____ go to the art gallery with us. If there _____ enough tickets, I’d let you know.