At first ______, the bag seems made of real leather. But actually it is just an imitation.　 

If we keep wasting so much energy, ________ are that our oil wells will dry up and the environment will be destroyed.

In order to prevent people spreading rumours through the Internet, the government decided to place ______ on the freedom of spreading news on line.

— If you like, I can do some shopping for you.— That's a very kind_______. 

All the students are looking forward to the first _________ to pass the College Entrance Examination.