—It’s difficult to tell this picture from that one.—Yes.The differences between the pictures are very________.
. If you want to sell your product you must _____ it.
New medicines and instruments ______ every day to extend life.
A red sky in the morning ______ to be a sign of bad weather.
Hundreds of jobs _______ if the factory closes.
“Look! Everything here is under construction.” “What is the small building that ______for?”