A. the safety of using them
B. the non-renewable forms of energy
C. the increase in global temperatures
D. the greater quantities of carbon dioxide in plants
A. it is dangerous sometimes
B. it is not available in many places
C. it is polluted
D. it costs a lot to exploit
A. it is inefficient
B. an cause accidents
C. it is non-renewable
D. it is not leaking
A. Fossil fuels are unlimited and safe to use in the distant future.
B. Hydro-power is impossible in places where dams cannot be built.
C. Like any other renewable sources of energy, solar energy has become disadvantages.
D. The use of solar energy and wind power depends on the weather.
A. builds up
B. declines
C. decreases
D. gets smaller
A. master's degree
B. doctoral degree
C. doctorate
D. bachelor's degree
A. excavate
B. excavating
C. excavation
D. excavated
A. set
B. take
C. put
D. get
A. parties
B. happenings
C. events
D. contests
A. successful
B. successfully
C. success
D. succeed
A. traditional
B. popular
C. new
D. unique
A. which
B. whom
C. whose
D. what
A. doesn’t your sister
B. doesn’t she
C. does your sister
D. does she
A. research
B. promotion
C. growth
D. conservation
A. favourite
B. great
C. social
D. academic
A. have been waiting – haven’t been receiving
B. have been waiting – haven’t received
C. have waited – haven’t received
D. have waited – haven’t been receiving
A. visit
B. visited
C. would visit
D. will visit
A. waited
B. have been waiting
C. have waited
D. was waiting
A. Having planted
B. To plant
C. To have planted
D. Being planted
A. to construct
B. which constructed
C. constructing
D. to be constructed
A. go
B. went
C. goes
D. going
A. reads
B. to read
C. read
D. reading
A. have been working
B. has been working
C. had worked
D. work
A. been invited
B. inviting
C. invites
D. invited
A. screw
B. screechy
C. scream
D. screen
A. rugby
B. nearby
C. cycling
D. apply
A. strength
B. event
C. athlete
D. wrestling
A. official
B. cycling
C. become
D. aquatic
A. advance
B. gymnasium
C. solidarity
D. variety
A. nation
B. gather
C. facilities
D. stadium
A. We bought two bicycles, of which neither worked well.
B. We bought two bicycles which neither of worked well.
C. We bought two bicycles neither of which worked well.
D. We bought two bicycles, neither of which worked well.
A. Had my tutor not helped me, I couldn’t make such a good speech.
B. If my tutor didn’t help me, I couldn’t make such a good speech.
C. If it hadn’t been for my tutor’s help, I couldn’t have made such a good speech.
D. If my tutor hadn’t helped me, I could have made such a good speech.
A. The room for three months hasn’t been cleaned.
B. The room has been cleaned by nobody for three months.
C. The room hasn’t been cleaned for three months.
D. The room hasn’t been cleaned by somebody for three months.
A. Competitive and demanding people believe that lifelong learning is the key to success in today’s labour market.
B. Lifelong learning is believed to be the key to success in today’s competitive and demanding labour market.
C. Today’s labour market is competitive and demanding because people believe that lifelong learning is the key to success.
D. Believing that lifelong learning is the key to success, people now live in a competitive and demanding labour market.
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