You must check both roads when you cross an intersection.

Better say: When crossing an intersection, you must look both ways.

I went straight as he said, but there was nothing. **Correct sentence!~ ^^ 

There were lots of high rises in Seoul.--**Correct sentence!~ ^^ 

I will go with her. I believe that she will miss the location. **Correct sentence!~ ^^ 

I think this machine can't digitize my photo.--**Correct sentence!~ ^^ 

I turned on GPS, but it couldn't locate my postion.

Better say: I turned on GPS, but it could not find my location.

He goes his sister's house because her house is close by his.

Better say: He goes to his sister's place because it is close to his.

Everyone filled out this form before meeting her. **Correct sentence!~ ^^ 

We only accept photo ID or driver's license. 

Better say: We only accept photo IDs and driver's licenses.

The entire organizations work for the president. --**Correct sentence!~ ^^ 

She has been expecting to meet her favorite singer at concert. 

Better say: She has been expecting to meet her favorite singer at a concert.