When he got to _____top of the mountain, he was almost out of______ breathA .the ; a B. the ; the C the; / D. a ; /
It was not until he came back _____ he knew the police were looking for him.
Was _____ that I saw last night at the concert?
It is _____ my father worked _____ I work now.
It is the protection for the trees _______ really matters, rather than how many trees are planted.
It is _______ he often fails in exams ______ makes his parents worried about him.