Shortly after the accident, two___________ police were sent to the spot to keep order.
| A．dozens of | B．dozens | C．dozen of | D．dozen |
_________ to 100℃, water will boil.
| A．Being heated | B．Heated | C．Heating | D．To heat |
He __________ his aunt’s when he went to Wuhan on business.
| A．called on | B．called at | C．dropped in on | D．dropped in |
You’d better take something to read 
when you go to see the doctor __________ you have to wait.
| A．even if | B．as if | C．in case | D．in order that |
---- Tom, why are you late again?
---- Sorry, manager. My car _________ on my way to the office.
| A．broke up | B．broke down | C．broke out | D．broke off |
---- Shall we go for a picnic this weekend?
---- Well, __________. We’ll have to see if the weather is fine.
| A．it all depends | B．it depends on | C．OK | D．I don’t know |