ohn coming over this weekend— He should, but he _______ not. He seems to be busythese days.

om knocked at the door, I was busy ________ my homework and my brother was busy ________ a model plane.

The computer systemsuddenly while he was searching for information.

Ever since the patients moved to the new hospital last year, they better medical treatment

absent for twoweeks, so he had a lot of homework to ________