I think the most helpful invention is light bulb. It seeing in the dark, and it gives people more time to work and play every day.A. used to B. is used to C. is used for
– Do you know_______ this pencil case is? – Let me see. Oh, it's_______.
Which of the following isn’t a capital city?
We will arrive _______ Shanghai _______ the evening of April 28th.
There is ____ “l” and ____ “u” in the word “luck”.
Our house stands alone ______ the street.