All the _______ things need air and water. Without air or water, nothing can stay _______.
| A．living; living | B．living; alive |
| C．alive; alive | D．alive; living |
I don’t know if I _______ free tomorrow. If I _______, I will go to the bookstore.
| A．am; am | B．will be; will be |
| C．will be; am | D．am; will be |
Someone is knocking at the door. It _______ my mother. It’s time for her to be back.
| A．can be | B．may not be |
| C．must be | D．mustn’t be |
The floor is so wet. Let’s _______.
| A．stop mopping it up | B．stop to mop up it |
| C．stop mopping up it | D．stop to mop it up |
The flood in 1998 washed lots of houses _______ and lots of people _______.
| A．on; died | B．off; die |
| C．away; die | D．away; died |