We were in _____ when we left that we forgot the airline tickets.

 --- How many of you have solved the math problem?--- ________, the math problem is far too difficult for us to work out. .

—Doesn’t he feel       impolite when he laughs with his mouth full of food?—I will ask him to pay attention to his behavior.

I prefer a college in Beijing to       in Shanghai, because I like the climate in Beijing.

 It’s an either-or situation—we can buy a new car this year or we can go on holiday but we can’t do       .