I think this is the most interesting thing _____has happened to us

I think this is the main part of the i do not think this dress is ( )for the party. I think this computer is the cheapest.(改为否定句) This is what I think. This is the boy ----------I think (who/that)is the smartest.是用that 还是who? this is the best hour i can think of that i havehad in the pas what do you think of this dish?this is the best dish i have ever had. I think this is the most (i_)以i开头的关于朋友的快 I think this TV s____ is boring I think this skirt is too (e ). I think this is against the____(法律). I think this box is made of( ) i think.this is what 改成复合句 This is what I think.什么句式 I think this a( ) is right. i think this life is overrated. I think this programme is boring的同义句I ______ think this programme is ______ this is what i think 还是this is how i think.哪个才是对的?