Directions: Fill in the blanks with the expressions given below. Change the form where necessary. Each expression can be used only once. open the door to, keep back, be tied to , feel overwhelmed by, give away, give authority to, be confined to, be/get caught up in, stand out, strip off 1. The safety of those students the demonstration ( 游行示威 ) must be guaranteed. 2. Many young mothers the home and children. 3. The contract research members to use anything in the laboratory. 4. An ordinary advertisement can not in a competitive advertising industry. 5. Jack his sweater and threw it onto the couch. 6. Nowadays, many young people the fierce competition in the job market. 7. She tried to smile, but her tearful voice her . 8. The risk of infection relatively small groups. 9. Research on genes should new medical treatments. 10. She told us most of the story, but something about her uncle.