单选
( )1.______years ago,early men used a stick,a large piece of wood and dry leaves to make a fire.
A.Million B.A million C .A million of D.Million of
( )2.Metals are melted_______they can be made into different shapes.
A.so B.that C.so that D .so that's
( )3.Some students may forget to_______the lights and fans in their classroom.
A.switch of B.switch offf C.switch on D.switch over
( )4.There are two fire extinguishers____the corridor____the ground floor.
A.in,at B.on,in C.at,on D.in,on
( )5.—What can you see when there is a gentle breeze?
—We can see people ______in the countrysibe.
A.flying kite B.flying a kite C.flying kites D.to fly kites
( )6.The ciou in the sky moved______.
A.quick B.more quick C.quickly D.more quickly
( )7.Heavy objects may fall______cars in the streets.
A.on B.onto C.quickly D.into
( )8.We must keep sea water clean and stop______it.
A.polluting B.pollute C.to pollute D.polluteing
( )9.If there is on rain,we will have on water to brush our_______.
A.tooth B.teeth C.teeths D.teethes
( )10.—How can we save water?
—We can save water by ______ taps.
A.fixing driping B.fixxing dripping C.fix drip D.fixing dripping