The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.
Passengers are permitted __________ only one piece of hand luggage onto the plane.
Having finished her project, she was invited by the school __________ to the new students.
Bill suggested __________ a meeting on what to do for the Shanghai Expo during the vacation.
Susan wanted to be independent of her parents. She tried __________ alone, but she didn't like it and moved back home.
Lydia doesn't feel like __________ abroad. Her parents are old.