Past simple or Present perfect

"The photocopier ... down 3 times yesterday"

(break)

"The photocopier ... down 3 times"

(break)

"I ... my phone, and I can't find it" 

(lose)

"Michael is a colleague of mine. I ... him for over 10 years"

(know)

"I ... a lot of interesting people at the conference last week"

(meet)

"It's good to see you again. I ... you for ages."

(not see)

"I ... to the office party last night. I was too tired."

(not go)

"The secretary ... four emails since morning."

(write)

"This company ... 200 people so far"

(employ)

"Peter ... the report yet."

(not read)