I will work as hard as I can _____ for the final exam.
A. prepare B. to prepare C. preparing D. prepared
_____ there are many different interpretations of our body language, some gestures seem to be universal.
A. When B. While C. Because D. Since
The speaker raised his voice but still couldn’t make himself _____.
A. hear B. to hear C. heard D. to be heard
Theme parks try to make sure that visitors leave _____ more about their theme.
A. to know B. knowing C. know D. known
Mother _____ us stories when we were
young. 
A. was used to tell B. is used to telling C. used to tell D. used to telling
The book was so _____ that I couldn’t help laughing from beginning to end.
A. amused B. bored C. amusing D. boring
