27. You need to contact your doctor if the symptoms ( ) for a day.

13. Advocates of studying abroad believe students will reach new levels of intercultural understanding far exceeding what they ( ) be able to accomplish just at home.

12. If you need me to help with your teleconferencing arrangements, I can be reached with the touch of a single button on ( ) special phone of Harry's.

11. The department secretary was ( ) the guest speaker at the station at 10 this morning, but the speaker's journey was canceled on a short notice.