The Communist Party of China was set up _________July, 1921 and we will celebrate her 100th birthday this year.

1. The Communist Party of China was set up _________July, 1921 and we will celebrate her 100th birthday this year.

A. on B. at C. in D. by

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1. If you want to have a good knowledge of a person, you need to learn more _______him.

A. about B. of C. on D. at.

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2. The Tianwen-1 Probe landed on Mars May 15th, 2021.

A. at B. in C. to D. on

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3. In which of the following pictures is the dog behind the sofa？

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