Staying in hospital and taking special medicines ________ drug users an opportunity to stay away from drugs, which is________ the key to breaking the addiction to drugs lies

Why are there so many ants on the cake—Because ants smell things _________.

There is _______ “s” and ________ “u” in the word “bus”.

The parents were shocked by______news that their sonneeded______operation on his knee.

Do you think Peter is free today?—I don’t think so. Recently he bas been _______ the most of his time to prepare for the final examinations.