Social attention should be paid our earth from .
| A． to prevent; being polluted | B． to preventing; polluted |
| C． to prevent; polluting | D． to preventing; being polluted |
— He ought to have been warned of the danger.
— ______, but he just wouldn’t listen to me.
| A．So ought he | B．So he was |
| C．So was he | D．So he had |
The traffic problem we are looking forward to seeing _____ should have attracted the local government’s attention.
| A．solving | B．solve |
| C．to solve | D．solved |
— He hasn’t finished the work yet.
— Well, he _____.
| A．ought | B．ought to |
| C．ought to have | D．ought to have finished |
He had promised me to come to the party, and _____.
| A．so did he | B．so he did |
| C．so he would | D．so would he |
The country life he was used to _____ greatly since the opening policy.
| A．change | B．has changed |
| C．changing | D．having changed |