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

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

We have done things we ought not to have done and ________ undone things we ought to have done.

　　A. left　　　　　　　　　　　　　B. leave

　　C. will leave　　　　　　　　　　 D. leaving

They decided to leave the waiter a big _____ because the food and service had been excellent.

　　A. note    B. reward    C. tip    D. gift

A landing on Mars is within the _____ of current physical theory.

　　A. scheme    B. scope    C. scrap    D. scale

　　　and we will complete the task sent to us.

A.Another hour　　　　　　　　　　　B.An hour later

C.After an hour　　　　　　　　　　D.In an hour