Do fish sleep I think they’re swimming around .-Of course they sleep. But they sleep with their eyes open.

With all his money, he _________ worry about a little thing like 5 cents!

It ________ be the postman at the door. It’s only six o’clock. [ ]

Can you _______ me your bike —With pleasure. But you mustn’t ____ it to others.

Siberian Tigers ________ and killed at such a speed that they will disappear from the earth in the near future.