—Did you see who the driver was?— No, so quickly _____ that I couldn’t get a good look at his face.
The police always take advantage of dogs’ ____ sense of smell to search for something.
---I was riding along the street and all of a sudden, a car cut in and knocked me down. --- You can never be ______ careful in the street.
A dozen ideas were considered _____ the chief architect decided on the design of the building.
Scientists are trying to develop a special material, ________ they will make use of in spacecraft.
He was absent for two weeks, so he had a lot of homework to ________.