30．Don't forget to               the lights when you leave the room．

A．turn on          B．turn down               C．turn up               D．turn off

A

Most snow looks white, but it is really the color of ice．Snow is ice that comes from snow cloud．Each snowflake begins with a small drop of frozen water．More water forms around this drop．The way the water freezes gives the snowflake its shape．

No two snowflakes are ever just the same size or shape．Sometimes the snowflakes are broken when they come down．Other snowflakes melt as they fall, All snowflakes are flat and have six sides, if they are not broken or melted．When the air is cold and dry, the falling snowflakes are small and hard．If the air is wet and warm, the snowflakes are big and soft．

Would you be surprised to see snowflakes as big as your head falling from the sky? It happened once in the United States．It could happen again．

29．What do you think                   her           ?

A．make, sad        B．makes, sadly           C．makes, sad           D．made, sadly

28．I think Jack does his homework           than his sister．

A．careful                  B．more carefully         C．carefully            D．more careful

27．--Why did you all go swimming           Tom?

--Because he was ill at home．

A．with                  B．besides                   C．beside               D．except

26．A robot is a machine             can do some difficult work instead of man．

A．who                B．\                                   C．that                    D．what

25．Uncle Wang gave all his savings to the Hope School            he himself was not rich．

A．because                  B．as if                       C．though            D．or

24．Can you tell me which floor                 ?

A．does he live on                                       B．he lives in

C．does he live in                                               D．he lives on

23．Let's hurry! There are only two minutes             ．

A．leave                 B．to leave                  C．left                         D．leaving