In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
None of us expected that the chairman ______ at the party. We thought he was still in hospital.
The teacher simplified the reading materials, ______ it easy for the students to read.
The British team, ______ several attempts to climb Yulong Xueshan, decided to have another try this summer.
—You didn’t wait for Mr. Smith last night, did you? —No, but we ______. He didn’t return home at all.
John didn’t come along, ______ making it necessary for us to get someone else to replace him.