________ he ________ anything about this historic site— Yes. That’s why he suddenly becomes so obsessed with it.

Some keys _____ in Classroom 3F. Please ask the teacher ______ it.

Can’t we go there on foot?—________to take a boat.

I wrote a letter to John for his help during my high school years. without which Ithe college entrance exam.

still remember theaccident— Yes Actually, I have experiencednothing more ________