31.When there was a short ______ in the conversation, I asked if anyone would like anything to drink.
A.blank
B.space
C.pause
D.wait
32.You can do it if you want to, but in my opinion it's not worth the ____ it involves.
A.effort
B.strength
C.attempt
D.force
33.The main road through Little bury was blocked for three hours today after an accident ____ two lorries.
A.involving
B.including
C.combining
D.containing
34.Very few scientists _____ with completely new answers to the world's problem.
A.come to
B.come round
C.come on
D.come up
35.Hotel rooms must be _____ by noon, but luggage may be left with the porter.
A.departed
B.abandoned
C.vacated
D.displaced
36.The ____ physicist has been challenged by others in his field.
A.respectable
B.respectful
C.respective
D.respecting
37.I'll try to get in touch with him but he's_____ ever at home when I phone.
A hardlyB almostC rarelyD occasionally
38.With hundreds of works left behind, Picasso is regarded as a very ____ artist.
A.profound
B.productive
C.prosperous
D.plentiful
39.The city suffered ______ damage as a result of the earthquake.
A.considered
B.considerate
C.considerable
D.considering
40.Undergraduate students have no _____ to the rare books in the school library.
A.access
B.entrance
C.way
D.path