Susan decided not to work on the program at home because she didn’t’ want her parents to know what she __________.
Jack’s house has been broken into twice and now he takes________ against theft at any time.
The environmental organization calls on customers not to purchase these _______ packages of food, clothes and gifts.
People are advised not to smoke at home, since passive smoking is ________ topeople around them. Which is Not proper for the blank?
He stumbled(绊倒)on the _______ ground and fell flat on his face.
Many students today suffer from ________ problems, since they are under too much pressure.