—Will you give me a hand? I have some trouble_______ the scientific problem.—Don't worry. I'll try my best to help you _______.
He only said it for _____, he didn’t really mean it .
It will take _____ years to make robots _____ the most unpleasant things .
My life _____ a lot_____ than it is now .
I predict he will be an engineer _____ten years because he is so interested in making things.
If there are _____trees, the air in our city will be _____ cleaner.