According to the school rules, if a student _________ happen to damage something by accident,he/she should report it to a teacher or the office immediately.
| A．should | B．will | C．shall | D．would |
250. Every year Harvard University awardsto excellent foreign students in theoretical physics.
| A．bonus | B．scholarships | C．rewards | D．Pensions |
249. A_____ has taught us what atoms are made up of and how powerful the atom bomb is.
| A．seaman | B．salesman | C．naturalist | D．Scientist |
248. A group of the red scarves are playing on the seaside_______.
| A．sand | B．sands | C．sail | D．Salts |
247. He found it quite impossible to learn _____ well in less than 6 months so he registered for the next semester(term).
| A．Russian | B．Russians | C．Russia | D．Russias |
246. Nelson Mandela played and is still playing a leading ________ in ending apartheid(种族隔离政策) in South Africa.
| A．use | B．roles | C．role | D．Parts |