人类婴儿在第一年发育迅速。

Human babies ___develop rapidly in their first year.

随着时间的推移，我们的工作关系发展成了亲密的友谊。

Over time, our working relationship ___developed into a close friendship.

参加这门课程将帮助你发展沟通技巧。

Taking this course will help you ___develop your communication skills.