8. Usually passengers are required to arrive at _____ one hour before ______ takes off.
| A．airport; aircrafts | B．the airport, aircraft |
| C．an airport, a aircraft | D．the airport, the aircraft |
Sarah looked atfinished painting withsatisfaction.
| A．不填；a | B．a; the | C．the; 不填 | D．the; a |
---Which one of these do you want?
--- . Either will do .
| A．I don't mind | B．I'm sure |
| C．No problem | D．Go ahead |
After completing and signing it, please return the form to us in the envelope ________.
| A．providing | B．provided |
| C．having provided | D．provide |
The manager was concerned to hear that two of his trusted workers ______.
| A．will leave | B．are leaving |
| C．have left | D．were leaving |
Be- you can't expect me to finish all this work in so little time.
| A． | reasonable | B． | confident |
| C． | creative | D． | grateful |