____ 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 |
29．There are also instructions about the________of all the buttons and switches．
| A．purpose | B．function | C．power | D．Effect |
28．The university with two____campuses hasa student population of 50,000 in total．
| A．unique | B．single | C．separate | D．Alternative |
27．Let' s move all the products into the hall and_____them in a proper order．
| A．design | B．decorate | C．develop | D．Arrange |
26．The whole class_____searching for the missing boy when the heavy rain poured down
| A．was | B．were | C．had been | D．would be |
25．The other day,I remember, ____I bought the dress, I met my boss in the shopping mail
| A．when | B．which | C．that | D．Where |