No one could _________ the failure of the experiment as everything went smoothly at first.
| A．give an account for | B．account for | C．take account of | D．take into account |
It was so dark in the cinema that I could hardly ______ my friends.
| A．turn out | B．bring out | C．call out | D．pick out |
Those who are ______ their present situation will surely make no more advance in life.
| A．content to | B．satisfied of | C．pleased to | D．content with |
All her energies are ______upon children and she seems to have little time for anything else.
| A．guided | B．aimed | C．directed | D．focused |
At times the balance in nature is ______，resulting in a number of possibly unforeseen effects.
| A．troubled | B．confused | C．disturbed | D．puzzled |
Generous public funding of basic science would______a good many benefits for the country's health，wealth and security.
| A．result from | B．lead to | C．lie in | D．settle down |