Not until he went through real hardship ________the love we have for our families is important.
| A．had he realized | B．did he realize | C．he realized | D．he had realized |
After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys ______ to go to school.
| A．to be encouraged | B．been encouraged |
| C．being encouraged | D．be encouraged |
Generally speaking, according to the directions, the drug has no side effect.
| A．when taking | B．when taken |
| C．when to take | D．when to be taken |
Only when your identity has been checked, ___________.
| A．you are allowed in | B．you will be allowed in |
| C．will you allow in | D．will you be allowed in |
Great as Newton was, many of his ideas _______ today and are being modified by the work of scientists of our time.
| A．are to challenge | B．may be challenged |
| C．have been challenged | D．are challenging |
Some passengers complain that it usually _________so long to fill in travel insurance documents.
| A．costs | B．takes | C．spends | D．spares |