34. －Are you sure you have to? It’s been very late.
－I don’t know ________ I can do it if not now.
| A．how | B．what | C．when | D．That |
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 |
Corruption is _______ problem in countries across the world, with developing countries often believed to be more serious, although there is no evidence to suggest this is _______case.
| A．a; the | B．the; a | C．不填; the | D．a; a |
— How much influence will your time in high school have on the rest of your life?
— It ______ be quite a lot, or perhaps only a little.
| A．might | B．must | C．should | D．can |