Whydoyou hang that photograph above thefireplace— ______ visitors of the memorial days of Long March，Sir.

I’ll wait for you at the gate of the Music Hall. See to ________ that you’ll get there on time.[ ]

The doctor advised me to go on a diet because I _____ weight during the last two months

ws shocked thepublic,________ to great concern about students’safety at school

(2013·吉林长春高中毕业班第一次调研)Many athletes are clear that the Olympic Games are the only time ________ they will be watched by thousands of millions.