1. Is Martha meeting us at the restaurant? Is Martha going us at the
restaurant?

2. Emily will sweep the floor and Jason will wash the
dishes.
Emily will be sweeping the floor while the dishes.

3. It's been months since they last cleaned the carpets.
They ... the carpets for
months.

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.