6、 It is a small country, yet has a lot of _________ resources.
A．potential
B．unknown
C．secret
D．unlimited
7、 ________ the difficulties of exercising, many people prefer to be on a diet to lose weight.
A．Aware of
B．Aware
C．Being aware
D．To be aware
8、 Our kitchen is a mess. We________any cleaning for weeks.
A．didn't do
B．haven't been doing
C．don't do
D．haven't done
9、 By my 50th birthday, I ________in my current profession for over 20 years．
A．would, have been
B．would be
C．will be
D．will have been
10、 Those good traditions have been passed ________ the younger generation.
A．on to
B．to on
C．cross to
D．to
11、 He told me that he ________in Spain the previous year.
A．has been working
B．had been working
C．has worked
D．had been worked
12、 Don't feel like ________ out today.
A．go
B．going
C．to go
D．gone
13、He was told he could join the army when he ________ old enough.
A．would be
B．should be
C．was
D．were
14、 I want to have this ________ by tomorrow morning.
A．fix
B．fixes
C．fixed
D．fixing
15、 You know that's right, ________ ?
A．is it
B．isn't it
C．do you
D．don't you
16、 He ________studied, yet he passed every exam.
A．frequently
B．little
C．regularly
D．rarely
17、 If you had had an umbrella, you ________ wet.
A．would havegotten
B．would not have gotten
C．will not get
D．will have gotten
18、I spoke to several people at the cocktail party. Was John one with the red hair?
A．(blank)
B．a(chǎn)
C．a(chǎn)n
D．the
19、 Do earthquakes ________often in North America?
A．break
B．break out
C．happen to
D．occur
20、 My students' sleepless nights became________ as the examinations approached.
A．so frequently
B．much more frequently
C．more frequent
D．far more frequent than
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