He is always ready to help others, seldom, _____, refusing them when they turn to him.
| A．if any | B．if not | C．if never | D．if ever |
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 |
People spend many years learning about favorite sports and ________ how to do them well.
| A．practice | B．practiced |
| C．practicing | D．to practice |