It’s polite ______ “Thank you” when you receive something from someone.
| A．says | B．say | C．saying | D．to say |
She is often seen ______ the old woman.
| A．help | B．helping | C．to help | D．help to |
_____ this way, you can work out the math problem.
| A．Of | B．By | C．On | D．In |
All the information _____ writing the report.
| A．is used for | B．is used to | C．is used as | D．is used by |
The police found the lost car _____.
| A．by mistake | B．by accident | C．with mistake | D．in accident |
I am a League Member. I volunteer my time _____ others.
| A．help | B．to help | C．helping | D．helped |