35. Difficulties and hardships have ________ the best character of the young geologist.

A. brought in　B. brought up　　C. brought out　D. brought about

33. David apologized for ________ to inform me of the change in the plan.

A. his being not able　　　　B. him not to be able

C. his not being able　　　　D. him to he not able

34 In that country, guests usually feel that they are not highly ________ if the invitation to a dinner party is given only three or four days before the party date．

A. regarded　B. thought　　　C . admired　　D. concerned

32. Mr. Barret doesn’t think that all bad language should be allowed. In his opinion, there are _______ that should be kept up.

A. degrees　　B. levels　　　C. limits　　D. standards

31.-Did you find the missing couple in the mountain yesterday?

-No, but we ________ to get in touch with them ever since.

A. have tried　　　　　 B. have been trying

C. had tried　　　　　　D. had been trying