Sustainable development is long-term ________which focuses on the environment and ________ natural resources.
| A．plan; preserve | B．plan; preserving |
| C．planning; preserving | D．planning ;preserve |
It__________ long before we __________the result of the experiment.
| A．will not be ； will know |
| B．is； will know |
| C．will not be ； know |
| D．is ； know |
If you __________ attend the party , you'd better leave now.
| A．are going to |
| B．will |
| C．were to |
| D．should |
I don't know whether my sister will come or not, but if she __________ , __________.
| A．will come ；so I will |
| B．comes ； so will I |
| C．will come ； so I do |
| D．comes ； so do I |
Food supplies in the flood-stricken area __________. We must act immediately before there's none left.
| A．have run out |
| B．are running out |
| C．have been run out |
| D．are being run out |
Stand over there __________ you'll be able to see the oil painting better.
| A．but |
| B．till |
| C．and |
| D．or |