Class 10 Tenses Exercise

Complete the following sentences using an appropriate verb form.

The sampling sites were up to 4 miles below the ocean’s surface. To catch deep-sea creatures, the team ………..1……….. a scoop to the ocean floor. Before this expedition, researchers ………..2……….. that few creatures would be able to live in the harsh Antarctic Ocean conditions. But the scientists ………3………. in for a surprise. They ………4……….. unexpected diversity among deep-sea creatures. What’s more, many of these creatures had never before ………5………… For example, of the 674 species of isopods ……….6……….. up by the team, 585 were new to science.

1. a) lowering; b) have lowered; c) lowered; d) had lowered

2. a) have thought; b) had thought; c) thinking; d) has thought

3. a) are; b) were; c) have been; d) had been

4. a) have found; b) found; c) were finding; d) have been

5. a) seen; b) being seen; c) been seen; d) saw

6. a) picked; b) had picked; c) picking; d) pick

Answers

The sampling sites were up to 4 miles below the ocean’s surface. To catch deep-sea creatures, the team lowered a scoop to the ocean floor. Before this expedition, researchers had thought that few creatures would be able to live in the harsh Antarctic Ocean conditions. But the scientists were in for a surprise. They found unexpected diversity among deep-sea creatures. What’s more, many of these creatures had never before been seen. For example, of the 674 species of isopods picked up by the team, 585 were new to science.