25. Welcome to the Historical Museum, everyone! This stone knife _______ in South Africa and experts can’t be exactly sure about its use.
| A．had been found | B．was found | C．has been found | D．would be found |
Paul does nothing but _____ all day long.
| A．play | B．to play | C．playing | D．played |
I saw Mary ____ the house.
| A．open the door and go into | B．to open the door and to go into |
| C．open the door and to go into | D．open the door and went into |
Mr. White was seen ______ the Palace Museum.
| A．enter | B．to enter | C．entered | D．to entering |
I was surprised______.
| A．watching him to eat so quickly | B．watch him eat so quickly |
| C．watching him eat so quickly | D．to watch him eat so quickly |
I know him ______ a good football player while in college.
| A．to have been | B．to be | C．was | D．had been |