Please help me to check my sentences below:

(1) Last night, I was awakened by a sound. I was scared, so I woke up my friends too. / I woke my friends up too.

(2) I crept in / to the door.

(3) I believe that hard work can make you more cleverer and will get you good results.

(4) Another key to get good results is to concentrate when the teaching is teaching.

(5) Suddenly, I heard a / the screeching of brakes.

(6) An ambulance and petrol car arrived at the scene. The police took some measuements at the site / scene. They interviewed / talked to some of the passengers in order to know how the accident had hapened.

Really thanks!!