大哥哥 姐姐 帮下忙了 1.（ ）lf you spend____more time on your English s

大哥哥 姐姐 帮下忙了
1.（ ）lf you spend____more time on your English study,you'll be good at it sonner or later
A a few B few C a little D little
2.( ) Ice and snow_____houses in the North Pole
A are used to building B are used to build C used to build D used to building
3.( )Mary's brother is a soldier.He_______since last May
A has joined the army B became an army man C has been in the army
D joined the army