When he___ ____ the room,the doctor______ ____ another ______ ______当他走进房间,医生在为另一个病人量体温

came into was taking patient‘s temperature

When he walked into the room,the doctor was taking another patient's temperature.
或者用现在进行时，也是可以的。
walks into/is taking/patient's temperature

got into, was examining, patients'

came into was measuring patient's temperature

went into,was taking,patient's temperature