When walking down the street, I came across David, whom I _____ for years.

(2013·北京东城二次联考)—________ you interrupt now？Can’t you see I’m on the phone?—Sorry，sir，but it’s urgent.

Much new and high technology has been introduced from America, great increase in production of the company.

When you getthe paper back, pay special attention to what ________.

e finally ______ to get all the workdone, we were so exhausted that we simply felt like lying down and having agood sleep.