Water is very dangerous sometimes. So we must be careful _____ it.
| A．of | B．with | C．to | D．in |
In our city, _____ middle school students want to be a teacher in the future(将来) every year.
| A．thousand | B．thousand of |
| C．thousands of | D．two thousand of |
My brother is _____ his homework. He often _____ his homework at home.
| A．does； doing | B．doing； do |
| C．do； doing | D．doing； does |
—Here is a schoolbag. Whose is it? —Oh, it’s _______ Thank you.
| A．my | B．mine | C．me | D．I |
—_______ is this pen？ —It’s mine.
| A．What | B．Whose |
| C．Where | D．How |