.
No one knows when such a custom first __________.
| A．formed | B．came into being |
| C．was come into being | D．was forming |
With online course Crazy English has over 20 million students all over China _____the class through the Internet.
| A．attending | B．attended | C．attend | D．to be attending |
–There were already five people in the car but they managed to take me as well.
--It _____ a comfortable journey.
| A．can’t be | B．shouldn’t be | C．mustn’t have been | D．couldn’t have been |
–Why, I couldn’t get you on the phone this morning.
--We _____ tennis in the yard when you called.
| A．must be playing | B．could be playing |
| C．must have played | D．must have been playing |
Tom as well as his classmates _____ Japanese in Japan.
| A．are studying | B．have studied | C．studies | D．study |
The boy lay on his back, with his teeth______, his right hand_______, and his glaring eyes ________ _straight upward.
| A．set, rising, looked | B．set, raised, looking |
| C．setting, raised, looked | D．to set, raising, looking |