The recent research attempts to the effectiveness of different drugs used for the new virus.
| A．cover | B．guarantee | C．estimate | D．evaluate |
He packed his suitcase, ________ the door and rushed downstairs as fast as he could.
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—I’ll repeat the phone number: 0571-88145412. Can you catch it?
—________.
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It was ________ of my secretary not to have let others disturb me this morning when I was occupied with my work.
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“Without Chinese toys, kids around the world ________ not have so much happiness.” said an European Union official.
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. I was lucky enough to get on the train before it ________.
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