In the botanical garden we can find a(n)____of plants that range form tall trees to small flowers.

As civilization______, more and more people have realized the importance of preserving rare animals from extinction.

I can meet you at eight o'clock; _____ you can call for me.

I started into the darkness and wonderful if he was as_____my presence as I was of his.

4．If people feel hopeless, they don’t bother to _____the skills they need to succeed.