If you don' t know a word, you can ________ the word in a dictionary.
_____ time, the teacher had us do half of the exercises in class and complete the other half for our homework.
When _____ about one of the biggest concerns today, many citizens mentioned the sharp rise in housing price.
The purpose of the article is to draw public attention _________ the problem.
The movie Gravity won seven awards at the Oscar night, _____ was beyond the director’s wildest dream.
The girl _______ a green coat looks more elegant than her companion.