To _________ nature is to help ourselves , or we will be punished.
It was a difficult time, but we never ________ hope.
–How about the exhibition that day? --It was very noisy, but that didn’t ________ me.
–Do you know the man under the tree? --Sorry, I don’t know _______.
–Waiter, $ 20 for dinner, right? --I’m afraid $25, sir, for drinks are ________.
–How many students are there in the classroom? --__________. They are all in the lab.