One way to ________ species under threat of extinction—whatever the cause—is to remove them to zoos or parks and feed them there.
It's uncertain ________ the experiment is worth doing.
Do you know ________ he expects will give us a talk
He insisted that he ________ in good health and _______ to work there.
He said that he was fond of ________.
- May I borrow the ring - You can take _______ you like.