______trees we plant, ______ our Mother Earth will be.
| A．The little, the beautiful | B． The many, the beautiful |
| C．The less, the more beautiful | D． The more , the more beautiful |
How much time did you spend the new words in Unit 10?
| A．to learn | B．learning | C．learned | D．learn |
---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t | C．couldn’t | D．may not |
---Have you seen Dr. Adams recently?
---No. He __________ Hong Kong for an important meeting. He’ll come back tomorrow.
| A．has gone in | B．has been in | C．has gone to | D．has been to |
--- Would you come back to have dinner with us this evening?
--- I’d love to, ______ I have an important meeting .
| A．and | B．or | C．so | D．but |
There __________great changes in our hometown in the past fifteen years.
| A．has been | B．have been | C．was | D．were |