______ did you spend on the skirt? [ ]
You can study grammar _____memorizing it. [ ]
Li Lei can ______ English. But his brother can’t.
Benny is _________ 11-year-old boy. _________ boy comes from America.
In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ________ we have never experienced before, ________ makes us worried a lot about nature disasters.