Fill in the blanks with the suitable present perfect tenses of the verbs given in brackets.
Q1. Who _____________ (move) the files from my desk?
Q2. Nobody _____________ (see) Kate since she left college.
Q3. I __________________ (write) the letter; can you post it for me tomorrow morning?
Q4. Mr. Brown____________ (pay) your bill already. You can leave whenever you like.