__________ most efficient way to understand thousands of new words is to gain __________ good knowledge of basic word formation.
| A．A; a | B．The; / | C．A; / | D．The; the |
I felt it a great honour ______ to speak to you.
| A．to ask | B．asking |
| C．to be asked | D．having asked |
When you’re learning to drive, _______ a good teacher makes a big difference.
| A．have | B．having |
| C．and have | D．and having |
He looked around and caught a man ______ his hand into the pocket of a passenger.
| A．put | B．to be putting |
| C．to put | D．putting |
______ their service, the workers of the hotel are active in learning English.
| A．Improving | B．To improve |
| C．Improve | D．Having improved |
_____ the flies out, we had to shut all the doors and windows.
| A．Keep | B．To keep |
| C．Keeping | D．Having kept |