51、 As we know, physics ________the science of energy.
A．was
B．were
C．is
D．are


52、 ______，we should be glad
A．They arrive tomorrow
B．Were they arriving tomorrow
C．They were to arrive tomorrow
D．Were they to arrive tomorrow


53、 He got up to the roof ________aladder.
A．by all means
B．by any means
C．by means of
D．by no means


54、 There were 30 students and______ of them passed the exam.
A．every
B．every one
C．everyone
D．everybody


55、 This is a nice car, but we cannot_________ it.
A．provide
B．afford
C．supply
D．manage


56、 When she does something, Mrs. Brown feels that her little child is always_________
A．under way
B．in the way
C．on the way
D．by the way


57、 I didn' t know what to do but then an idea suddenly_________ me.
A．happened to
B．entered
C．occurred to
D．took place


58、 Even if they are on sale, these refrigerators are equal in price to, if not more expensive than,________at the other store.
A．anyone
B．the others
C．that
D．the ones


59、 She ________to her teacher for coming to school late.
A．excused
B．apologized
C．pardoned
D．confessed


60、 You will never guess whom I _________on the street yesterday.
A．ran over
B．ran out of
C．ran into
D．ran up to