--- ____ do you study for tests?---I study math by ____ lots of exercises.
We are offering prizes ________ best pictures.A.to B.for C.with
If you are ________ the right place ________ the right time,take a picture.A.in;at B.at;in C.at;at
Please connect the digital camera ________ the computer.A.to B.into C.with
There is someone at home because the lights are ________.A.out B.on C.not
Mary,please show ________ your picture.