The population problem may be ______ one of the world today.
| A．the most | B．most difficult | C．the greatest | D．more interesting |
_________ are good friends. We often play together.
| A．Jill and I | B．I and Jill | C．Jill and me | D．Me and Jill |
We find it ___________ to do some reading every day.
| A．easily | B．be enjoyable | C．helpful | D．interested |
Could you tell me ?
| A．who you are waiting for | B．who were you waiting for |
| C．what was happened | D．how to do |
It’s necessary ______ us to keep our pets clean everyday.
| A．of | B．for | C．with | D．between |
Oxfam Trailwalker on November 5th every year.
| A．took place | B．takes place | C．is taken place | D．is took place |