________ twice, the postman refused to deliver our letters unless we chained our dog.
| A．Being bitten | B．Bitten |
| C．Having bitten | D．To be bitten |
— Should I talk in English or French?
— Do as you _________ . We understand both.
| A．think | B．please | C．care | D．feel |
__________knowledge comes from practice is known to all.
| A．If | B．What | C．Where | D．That |
Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
| A．when | B．before | C．while | D．since |
______ surprised the hostess most is _______ one of her friends left the party without saying a word.
| A．What, what | B．What, that | C．That, that | D．That, what |
The arrival of the European settlers had a greaton the life of the Native Americans.
| A．fault | B．change | C．effect | D．result. |