----- Is that Mr.Smith over there? ----- No, it _____ be him --- I am sure he is much taller.
Large quantities of polluted water_____ into the sea so that lots of fish died.
---How do you find the movie you saw last night? ---_______. I just saw half of it
At first driving requires a lot of concentration, but over time, it just becomes_____.
---Don’t climb the ladder. It’s broken. ---______
The dangerous building could fall down any time, but that’s a risk we’ll have to_____.