More and more people have realized that we won’t havecleaner water to drink unless something _______soon.

（湖南省怀化市2014年高三第二次模拟考试）21. For more information, please send an e-mail, ______ you can also include your advice to us.

I’m sorry, sir. I’ve made lots of mistakes in the monthly exam.— Never mind. ___________, the exam is a bit difficult.

Isn’t that Ann’s husband over there— No, it ________ be him — I’m sure he doesn’t wear glasses.

Do you know whose car is it–It belongs to . It isn’t .