I would have come earlier, but I _____ that you were waiting for me.
| A．didn’t know | B．hadn’t know | C．would have known | D．haven’t known |
.Lucy is a college student who is hard-working, so she passed the College English Test Band 4 at her first__________.
| A．attempt | B．effort | C．struggle | D．factor |
The news came as no surprise to me, for I _______of it earlier.
| A．hear | B．heard | C．had heard | D．have heard |
We’ll arrive in_______ European country in half ___________ hour.
| A．a; an | B．an; an | C．a; a | D．an; a |
-- Have you moved into the new house?
-- Not yet. The rooms _______.
| A．are painting | B．are being painted | C．are painted | D．are being painting |
The United States _______one of the lowest smoking rates －25.5 percent of the population.
| A．is | B．have | C．has | D．are |