Not all insects are enemies of man. The silkworm spins threads of silk, which (A) [despite / though] the popularity of synthetic fabrics is still an important textile material. In addition to (B) [produce / producing] honey, the honeybee help farmers grow fruits, vegetables, and grains by pollinating their flowers. Also other insects such as ladybirds, beetles, etc. prey upon our insect enemies and thus help us to keep (C) [them / themselves] under control.
(A) (B) (C)
① though - produce --- themselves
② though - producing - them
③ despite - producing - them
④ despite - produce --- themselves
⑤ despite - produce --- them

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