35.He _____ the 6:30 train because he didn’ t leave until 6:35.　

A.mustn’ t have caught　　　　　　　　　 B.may not have caught　

’ t have caught　　　　　　　　　　 D.mustn’ t catch　

34.Besides being able to work for three days without drinking, camels can also live for a long time _____ small quantities of food.　

A.which　　　 　　　　　 B.on　　　 　　　　 C.by　　　 　　　　 D.to　

33.I was so familiar with him that I recognized his voice _____ I picked up the phone.　

A.while　　　 　　　　　　 B.after　　　 　　　 C.in case　　　 　 D.the moment　

32.-Is there a flight to London this evening?　

-There _____ be. I’ ll phone the airport and find it out.　

A.must　　　 　　　　　　 B.will　　　 　　　　　　　 C.might