key 。 they 。 obey 。 grey。
The room ________often cleaned by the students． will be 。 has 。 is。 was。
What the monitor said at the class meeting ________ quite all right． heard 。 listening。 sounded。 pronounced。
Jack came to the party_______． without being invited 。 without inviting。 without invited 。 without a invitation。
All things________，the planned trip will have to be called off． considered 。 considering。 to be considered 。 having considered。
—When can I call on you, afternoon or evening?
—________. I’ll be at home all the time.
