In ______ review of 44 studies, American researchers found that men and women who ate six key foods daily cut the risk of ______heart disease by 76%.
| A．a; the | B．the; a | C．a; 不填 | D．不填; a |
The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
| A．while | B．when | C．as | D．until |
— Do you know __________ they got to know each other?
— It was last year ________ they both taught English in China.
| A．when was it that; when | B．when it was that; that |
| C．when it was that; when | D．when was it that; that |
— It’s no easy task to catch a ticket on a website that receives 1 billion clicks daily.
—I can’t agree with you more. There ________ be errors for every single step.
| A．should | B．must | C．will | D．can |
—I wonder what makes you a successful manager.
—I ________ as a waiter for five years，which contributes a lot to my today’s work.
| A．serve | B．have served | C．had served | D．served |
----What’s that noise?
---- There’s a truck stopping outside．It’s someone something.
| A．deliver | B．to deliver | C．delivering | D．delivered |