27. As five children under 10 got drowned in a southern province, it is not socially _____ for
parents to leave children unattended at that age.
| A．acceptable | B．affordable | C．sustainable | D．believable |
Rather than sticking to the principles stubbornly, China is now adopting a new concept in economic policies in a/an _______way that shows its own characteristics.
| A．sustainable | B．flexible | C．invisible | D．available |
The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.
| A．thus | B．otherwise | C．therefore | D．later |
Don’t stand by when you come across________ have difficulty in supporting their family because of serious illness.
| A．Who | B．Whoever | C．Whichever | D．Whomever |
Death toll from Typhoon Haiyan in the Philippines _______ 3,637, after the strongest storm this year destroyed the central part of the country on Nov. 8, 2013.
| A．rose to | B．arose from | C．rose from | D．raised to |
To protect the environment, the local government has put up a lot of ______ to warn the citizens not to litter the ground.
| A．sighs | B．sights | C．signals | D．signs |