With the world economy growing weaker, for many young people, the dream of landing a good job is becoming harder and harder ________

John, how did your English exam go? — I thought I ____, but in fact I came in the top 10% in the class.[ ]

－What did the man over there say to you just now－He asked me _____________.

Why don’t you like geography–Because it’s_______.

Some scientists believe that there is no _______ that the new medicine for cancer will be found. (　　)