You must the water in the tank clean if you have a goldfish.

He took off his coat, _____ all his pockets, but couldn’t find his key.

a new graduate, and it seems that he hasdifficulty in dealing with ________ problems arise

Though Kongfu Panda 3 is popular with teenagers, it won’t be liked by ______.

I don’t know ______ or not the books _____ to the homeless children next month are really useful