Operation rooms should be kept free ______ bacteria of any kind[ ]

We missed a chance to win a goal.—_________!

__________,—I can play the guitar.

Actually it was the passenger ________ the driver that caused the serious accident on the road.

（2014重庆一中高三下第三次月考）4. —Why! I couldn’t get you on the phone yesterday afternoon?—We _____ kites in the yard when you phoned.