Would you like to tell me about the travel —Great. I really experienced ________.

下列各句中，没有语病的一句是

oys enters the classroom, smilingand______, and_______down to have their lessons

is in hospital.— Oh, really I _____________ know. I_______________ go and visit her.

It was _____ by the railway board that thecost of rail fares would be increased by ten percent.