To _______ its construction, the Potala Palace is _______ to a limited number of tourists every day.
A.preserve; available B.reserve; available
C.preserve; accessible D.reserve; accessible
The leaders of Catalonia said that he had decided to delay the declaration of independence ______ they could have a further negotiation with Spanish government.
A.in case B.in order to C.so that D.not until
Experiments _______ that children can be instructed in swimming at a very early age, as early as about two months.
A.are proving B.will be proved C.are proved D.have proved
Because of the progress he ______ in his performance, he was soon promoted to project manager.
A.had made B.had been made C.makes D.has been making
The man was so surprised at _______ that he did not try to escape or defend himself.
A.discovered B.discovering C.to be discovered D.being discovered
It is estimated that the number of tourists who travel abroad ______ in the past decade.
A.have doubled B.have been double
C.have been doubled D.has doubled
