— Li Fan won the first prize in the national physics competition. — I ________ he was the winner.

I set up email addresses for connecting with my parents last May. But I didn’t write to them as often as I ______. 

She ______ know the answer, but I’m not sure.

(2013·辽宁高考)Harry is feeling uncomfortable.He ________ too much at the party last night.

If people eat natural poisons by mistake, they ________ go to hospital without delay.