Although police could be seen everywhere, they seemed to be searching the houses almost ________.
| A．at ease | B．at random | C．at risk | D．at length |
The chairman thought _______ necessary to invite Professor Smith to speak at the meeting .
| A．that | B．it | C．this | D．him |
------Flight 302 to London_______ until 7:30 tomorrow morning.
-----No wonder I hear so many complaints from the passengers.
| A．has been delayed | B．delay | C．delayed | D．will be delayed |
When the American constitution ______into effect in 1789,it didn’t contain any words guaranteeing the basic rights of ordinary citizens.
| A．went | B．had gone | C．has gone | D．was going |
----How have you been doing recently?
----________.Nothing really goes wrong.
| A．Good luck! | B．I’ll keep my fingers crossed | C．Can’t complain | D．So long |
A beach house caught fire last night, ______seven students living in it.
| A．to kill | B．killing | C．having killed | D．killed |