strengthen

共同抚养宠物可以增进夫妻间的感情。

Raising a pet together can ___strengthen the bond between couples.

每天做俯卧撑可以增强你的手臂力量。

Doing push-ups every day can ___strengthen your arm muscles.

这些新的研究结果大大加强了我们的理论依据。

The new research findings significantly ___strengthen our theoretical foundation.