If you don’t know the word, you can _________ in the dictionary.
Boys, don’t lose____ in playing Angry Birds. It is bad for your eyes to play computer games for a long time.
have you been studying in this school?-Since two years ago.[ ]
“Great achievements can be done in _______ with nature, ” Schworer said.
I’d like to help ________ /’h?uml?s/ people.