He goes to work by bus. Which of the following is correct for the underlined word in the sentence?

—Lily, how do you usually come to school every day?—Usually ______ bike.

Don’t pay for the coffee. It’s        .

—Look at the monkeys running around on the rocks together. —Yes, the environment ______ to suit them very well. Let's see the tigers now.

—______ will the fog and haze last?—I’ve no idea. There is no sign of an end.