30、When a ship that sank in 1628 was recovered from the port of Stockholm, the scientists were overjoyed with the chance _____ the remains of the past.

A. examine                   B. examining          C. to examine                D. examined

29、The scientists are trying to find out what ______ caused the dolphins to strand themselves, a strange animal behavior hard to understand.

     A. was it that            B. that was that    C. was that which      D. it was that

28、The government has revised the budget, 5% of______ will be used to help develop the medium  and small sized enterprises.

     A. that                  B. whose        C. which            D. as

27、―Could we see each other at 3 o’clock this afternoon?

―Sorry, let’s make it _______ time..

A．other                        B．the other             C．another               D．other’s

26、Dogs have a very good _______ of smell and are often used to search for survivors in an earthquake.

A．sense                       B．view                    C．means                 D．idea

25、This is an amazing area of study ______ new discoveries are being made almost every day.

A．from which                                      B．by which       

C．in which                                          D．through which

24、

Unfortunately, all the equipment, the computers and the printers included, ______ in the big earthquake.

A．was damaged                                          B．were damaged   

C．has been damaged                                   D．have been damaged

23、--- Have you ever heard of the new model of computer, Tom?

 --- Yes, of course. But I haven’t decided whether to buy ________.

    A．this              B．it                C．one              D．that

22、Our teacher seems unhappy. We don’t understand _______ it was that made him feel that way.

    A．which           B．what            C．why              D．how

21、There is no _____ in trying to persuade him to join us, for he enjoys being alone.

    A．doubt            B．wonder          C．difficulty         D．point