11. It is three years_______ he got married.
A. before B. after C. since D. until
12. I think we students should _______ enough pocket money.
A. be giving B. have given
C. give D. be given
13. We know each other, but we don't know_______ addresses.
A. each others B. each others'
C. each other's D. each other
14. The icon is _______ and the information you need will appear on the screen.
A. double-clicked on B. to be double-clicked on
C. to double-click D. double-clicked
15. The sun_______ light and heat to the earth.