—At last I’ve made it.I am on top of the world.

—______

— Why can your neighbor know so much about London?

— He ____ have been there before.

---Do you go there ______bus?

---No, we go there ______a train.

---Which play shall we go and see?

---_________.

---I knocked over my coffee cup．It went right over ________ keyboard．

---You shouldn’t put drinks near ________ computer．

—How about your travel? 

—You can hardly imagine what difficulty we have had ______ the vast desert.

---These boxes aretoo heavy for me to move.

---Here, I’ll giveyou a hand _______ them.

-- How ________ will your birthday be?

-- It's in ________ time.

-- It must be Tom that forgot to close the door of the classroom.

-- It may be. But he is ________ the last one to leave.