Is this Tom and Sam’s room– No , it’s ours. _________ is on the fifth floor.

I’m sorry. I shouldn’t have blamed you for comingback later.— ________. I know you were worried about me.

sn’t often snow in my hometown inwinter, but it ___be rather cold sometimes.

It is _______ of the students to stay up readingtill late night before the final exam.

. There is such an occasion ___________ we know lots of words, but we can’t choose a suitable one to express ourselves.