The boys volunteer three hours _____ up the park near their school.
| A．cleaning | B．to clean |
| C．cleaned | D．with cleaning |
This month the weather __________ to change every day: One day is hot, the next is cold.
A. seems B. looks C. feels
Sam jumped __________ than any other player in the sports meeting.
A. higher B. taller C. high
We have been good friends __________ we joined the music club.
A. before B. since C. until
Do you know the lady __________ your sister is talking?
A. which B. with whom C. whom
__________ tourists will go to London for the Olympic Games this summer.
A. Many thousands B. Thousands of C. Thousand