Not until the teacher explained the importance of getting up early ______ we promise to come early.
| A．should | B．would | C．did | D．could |
All of the children ______ in the school play and they are in high spirits.
| A．are involving | B．involve |
| C．are involved | D．have involved |
______ no bus, we had to walk home.
| A．There was | B．There being |
| C．Because there being | D．There were |
During the rush hour they werein the heavy traffic．
| A．held on | B．held up |
| C．held down | D．held out |
--- The film we saw last week is very romantic.
--- ___ I did not think it romantic at all.
| A．With all due respect | B．I beg to differ |
| C．As predicted | D．I can’t agree with you more |
China made a commitment to the world in the Copenhagen Summit that by 2020, the carbon-intensity of its economy ______ fall 40% to 45%.
| A．shall | B．may | C．must | D．should |