— What was it that caused the party to be put off?
— ______the invitations.
| A．Because Tom delayed sending | B．Tom delayed to send |
| C．That Tom delayed sending | D．Tom delaying sending |
The fresh air in the morning is pleasant ________. You'd better get up early to do some exercise.
| A．to be breathed | B．to breathe |
| C．breathing | D．being breathed |
Do you wake up every morning ________ energetic and ready to start a new day?
| A．feel | B．to feel |
| C．feeling | D．felt |
The text is too difficult. The explanation of our teacher will help make it easy ________.
| A．to understand | B．to be understood |
| C．understood | D．understanding |
There was no signal in that faraway village and all my attempts ________ you failed.
| A．to contact | B．contacting |
| C．contacted | D．having contacted |
________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
| A．Having believed | B．Believing |
| C．Believed | D．To believe |