33. — It’s said that Williams will come to help us. — ______ we depend on him, we have to do most of the work ourselves.
The evening news comes on at seven o’clock and ______ only thirty minutes.
----- Must I turn off the gas after cooking? ----- Of course. You can never be ______ careful with that.
He told me he had been offered a well-paid ____, but he refused it.
He has written a lot of books, but ______ good ones.
Everyone here will thank the firefighters for the things they do to prevent fires ______ the environment safer.