— Why didn’t you try your best to get on the subway? — I tried to, but it started moving ______ I could get on it.
Things are ________ on Mars ________ on Earth because of the different gravity.
Did your father tell you ________?
There are only _________ new words in the passage, but I know _________ of them.
It’s good advice that of the twins wants to take it.
This task is ______difficult for us. We need ______people.