--Are you satisfied with the air today? --Not at all, it’s so foggy that I often get a cough. I think we all need much ________air to breathe.

 You’ll miss the bus ___ you walk more quickly. 

Don’t worry, Tom! I’ll send you an email __________.

 Mary noticed ________ with the English way of life.

–Kate, do you know__________it is from here to the gym.–About twenty minutes’ walk.