You should not go rafting ________ you know how to swim.
—Would you like to join me for a quick lunch before class? —______, but I promised Nancy to go out with her.
--- I am taking my driving test tomorrow. --- _______!
I’ll try my best to _____ the lost time.
It was ten o’clock _______ we got to the top of the hill.
_____ you take a taxi, you’ll still miss your train.