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　　1 ____ time ,he will make a first-class tennis player .

　　A Having given B To give C Giving D Given

　　2 ___in 1636 ,Harvard is one of the most famous universities in the United States .

　　A Being founded B It was founded

　　C Founded D Founding

　　3 Unless __to speak ,you should remain silent at the conference .

　　A invited B inviting

　　C being invited D having invited

　　4 ___,but he still couldn’t understand it .

　　A He had been told many times

　　B Having been told many times

　　C Told many times

　　D Although he had been told many times

　　5 When first ___to the market , these products enjoyed great success .

　　A introducing B introduced

　　C introduce D being introduced

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