Philippine and U.S. officials have finished reviewing an agreement governing U.S. bases, and an agreement on their status through 1991 is possible within a week, a source said Monday. In April, U.S. and Philippine panels began talks on the status of Clark Air Base, Subic Bay Naval base and four smaller installations. But the talks have stalled over compensation and other issues. The Philippines reportedly is asking $1.2 billion a year for the last two years of the lease, which ends in 1991, but U.S. officials are only offering half that amount. After 1991, any extension must be approved by two-thirds of the 23-member Philippine senate, where opposition to the bases is strong.