用所给的词或词组填空,完成下成的短文。It’s summer. Zoom and Zip _____in the lake. They are happy. It’s fall. Zoom and Zip _____. They eat a lot. Winter comes. Zoom and Zip don’t_____. They sleep. Spring comes Zoom and Zip_____. They _____.
Even the top students in our class can't work out this problem. So it _____ be very difficult.
This machine is very easy to use.______ can learn to use it in a very short time.
One of his friends ______ his daughter sometimes.
The game is _____ funny that many of them like it.
Are there _____ trees behind the house?