Helen （ ） her key in the office so she had to wait until her husband （ ） home.
（A）had left; came
（B）has left; comes
（C）left; had come
（D）had left; would come
Selecting a mobile phone for personal use is no easy task because technology （ ） so rapidly.
（A）will have changed
（B）has changed
（C）is changing
（D）will change
You can't move in right now. The house （ ）.
（A）has painted
（B）is painted
（C）is being painted
（D）is painting
