In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Architectural shingles are twice or _ times as thick as ordinary shingles.

A: three
****
Q: Every insect has _ legs, has six legs, has six legs.

A: six
****
Q: Coral reefs make up only _ per cent of the area of the Great Barrier Reef.

A:
five
****