The doctor refused to use traditional Chinese herbal medicine, __________ he was not sure about.

I have been looking for you everywhere. This is the _____ place in the world I would have expected to find you.

an I do for you– If you __________ see Mr. Smith, give him myregards.

Many sailors think that a thick fog is their ________ enemy.

Never give up. If you keep practising speaking English every day, you’ll make great progress.—Thanks for encouraging me. I know _______.