According to the rules and regulations, all payments _____ be made in cash in the shopping center.

My sister met him at Ningbo Grand Theatre yesterday afternoon, so he         your lecture. 

I always go to sleep ___________ the light on. 

--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?--________ my students have a try?

— May I take the magazine out of the reading room? — No, you can’t. You _________ read it here. It’s the rule.