) 1.A book ____ more than once if you want to understand it

) 1.A book ____ more than once if you want to understand it better.
( ) 1.A book ____ more than once if you want to understand it better.
A.must be readed B.must be read C.must to be read D.must read
( ) 2.“Thanks” should _________ after we get help.
A.be saying B.be said C.say D.said
( ) 3..Jack often does things foolishly so he ____ sometimes _____ by others.
A.is…laughed B.is …laughed at C.was…laughed D.has…been laughed at
( ) 4.This kind of flowers ______ever day ,or they’ll die.
A.can water B.can be watered
C.should water D.should be watered
( ) 5.How _____ the Great Pyramid (金字塔)_______ many years ago without modern machines.
A.is…built B.would…be built C.have…been built D.was…built
( ) 6.Today computers _____all over the world.
A.are used B.were used C.will use D.have used