A:waiting for
B:waited for
C:to wait for
D:to be waiting for
一辆拖拉机每趟可运苹果40筐,一个果园要运7200筐苹果,用18辆这样的拖拉机来运,要运____趟?
----The radio says that a new typhoon (台风) is coming.
---- Really, All the ____ (渔民)on the sea must come back.
把( )种颜色的球各8个放在一个盒子里,至少取出4个球,可以保证取到两个颜色相同的球.
如图由7个大小相同的正方体摆成的立体图形,它的俯视图是( )