—“Crash diets” make us lose weight fast and I am all into that. —But it_______better to work out.　   

——Must I come to see you again?——No, you _________.

–Who is the tallest boy?–It ______  be John. Because John is of medium height..

My car is covered with thick snow and now the engine simply ______ start.

---The work will take me another week. I’m really tired.---I think you          as well consult an experienced worker.