Verb conjugation of "clausurar" in Spanish

I ordered a cab at four o'clock in the morning which took me to the Central Bus Station. I was much to early because the bus would go just at seven o'clock. Anyway I was sitting there and listening to music.
Every school has some narrow minded teachers who are not willing in investing in progressive educational process. They do not grasp that schooling methods today are different from last century's methods.
I rarely heard someone speaking so bad about his nation, but again, it wasn't my business. We closed the lights at midnight and hoped for a few hours of sleep. The train shaked and threw us around in our beds.