serious the economic situation is, they still have confidence in overcoming all the difficulties.
A．Whatever B．Although C．Even though D．However
The teacher that his students had difficulty in English grammar, decided to give them more examples.
A．knows B．to know C．knowing D．being known
Over the past decades, sea ice is decreasing in the Arctic global warming.
A．as a result of B．on top of C．in front of D．in need of
Never in my dreams Zhao Benshan’s performance during the CCTV Spring Festival Gala was considered the best.
A．I could imagine B．could I imagine C．I couldn’t imagine D．couldn’t I imagine
The woman rushed out she felt the house shaking.
A．until B．immediately C．unless D．before
Many scientists believe that global warming, if , will cause extreme climate changes this century.
A．not stopping B．no stop C．not stopped D．without stop
