—Hi, Tom, why are you looking so tired?
—I'm tried. Because I ______ the living room all day.
| A．painted | B．have been painting |
| C．have painted | D．had painted |
_______ snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest.
| A．Not only they brought |
| B．Not only did they bring |
| C．Not only brought they |
| D．Not only they did bring |
Long,long time ago,there was a mountain.At the top of the mountain _______,in which an old monk used to tell stories.
| A．a temple stood | B．is there a temple |
| C．stood a temple | D．a temple was there |
I failed in the final examination last term and only then _______ the importance of studies.
| A．I realized | B．I had realized |
| C．had I realized | D．did I realize |
Only by practising a few hours every day _______ be able to master the language.
| A．you can | B．will you |
| C．you will | D．can you |
_______ the people have become masters of their country _______ science can really serve the people.
| A．It is only then; that |
| B．It was that; when |
| C．It is only when; that |
| D．It was when; then |