Scientists say it may be five or six years _____ it is possible to test this medicine to human patients.
It is the most instructive lecture that _____ Isince I came to thisschool.
Everyclassroom in this modern school is __________ with a new computer.
Nowhere else in the world __________ more attractive scenery than in Switzerland.
I'm calling to enquire about the position __________ in yesterday's China Daily.
My parents will move back into town in a year or __________.