Hey, can I ask you a favor —Sure, ______

I’m afraid I can’t pass the driving test tomorrow—! I’m sure you’ll make it

The son asks his dad why the chameleon(变色龙) can ______ the color of its background.

Researchers are now conducting hibernation experiment and can use chemicals to put living cells into sleep-like state_____ they don’t age.

Oh, no .Where is my purse — Don’t worry .I saw _______ black one in the drawer .Is it yours