The government must be very ______ about setting a policy, making no decision until they are quite sure it is the right one.
| A．particular | B．concerned | C．cautious | D．certain |
_____ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
| A．Put | B．Putting | C．Having put | D．Being put |
Having been attacked by terrorists, _____.
| A．doctors cane to their rescue | B．the tall building collapsed |
| C．an emergency measure was taken | D．warnings were given to tourists |
The disc, digitally _____ in the studio, sounded fantastic at the party.
| A．recorded | B．recording |
| C．to be recorded | D．having recorded |
According to a recent U.S. survey, children spent up to 25 hours a week _____ TV.
| A．to watch | B．to watching | C．watching | D．watch |
There is a new problem involved in the popularity of private cars _____ road conditions need _____.
| A．that, to be improved | B．which, to be improved |
| C．where, improving | D．when, improving |