When I arrived I saw the place was already ________ by two strangers in uniforms.[ ]

_____ all my colleagues, I’d like to show all my sincere thanks to you for your devotion to our research

Only since they gave up that good chance＿＿＿ to show their invention again.

—Shall we________to attend the meeting________at the end of this month?—Sorry, I don’t know.[ ]

How long have you _________ your watch It looks new.—Only about three weeks.