Mr. Smith works with a mobile phone company, but he _____________ for this international meeting, since he is on holiday.
“Underground” is the only word in the English language _______ begins and endswith the letters “und”.
People should ______ from ______ down the trees to protect the earth.
—Mr. Li’s never been to Shanghai, has he?— . He went there to attend a meeting last week.
—Wechat is a kind of fast, convenient and fashionable ______method. It can be used in our mobile phone.—What’s more, we can use it for free.
— Can you spare time to come to our Thanksgiving party?— Well, I don’t know ________