—— I will come to attend your lecture at 10：00 tomorrow. —— I’m sorry, by then my lecture will have ended and I＿＿＿my guests in my office. 

 Please don’t phone him between 1 and 3 p.m. tomorrow. He _________ a lecture then.

-- Who do you think ___ the book here?  --- It may be John. He was sitting here all the morning.

The telephone _______, but by the time I got indoors, it stopped.

(2013·安徽省芜湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years.