This math problem is ______ difficult ______ that one. [ ]

My friend is good at chess, he always beats me _____ it. [ ]

They often_____ the No.8 bus to go to the movies _____Sunday evening. [ ]

）In the exhibition, all of us felt _________ to see so many _________ things.

I am looking after Tom today.He’s been in my house ______________ 8:00 this morning.