English Grammar Past Tense 3

Ancient civilizations ___ the use of simple tools to cultivate their land.

• explore

• explored

• exploring

• explores

The dinosaurs ___ long before humans appeared on Earth.

• have disappeared

• disappear

• disappeared

• disappearing

Early humans ___ stone tools for hunting and survival.

• were not used

• did not use

• are not using

• does not use

The forest fires ___ several species to relocate last year.

• force

• forces

• forcing

• forced

Early naturalists ___ the migration patterns of birds in detail.

• was studying

• study

• studied

• are studying

During the last Ice Age, glaciers ___ a large part of North America.

• covered

• covering

• covers

• has covered

Archaeologists ___ not ___ the remains of ancient cities until modern tools were developed.

• did, discovered

• does, discover

• did, discover

• were, discovering

The river ___ its banks during the heavy rains last decade.

• overflows

• overflowed

• is overflowing

• has overflowed

Explorers ___ maps to record newly discovered territories in the 15th century.

• use

• uses

• used

• have used

The species ___ extinct after the habitat loss from deforestation.

• did not go

• was not go

• were not went

• did not went