The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.

What can your group do _____ the talent show? [ ]

There’s somebody at the door. Who ____ it be? Is it the postman? — No. It ______ be him. It’s just seven o’clock. It’s too early.

Thanks to the Great Green Wall, my hometown is getting more and more beautiful.

This kind of food must be ____ than that one.