Only when I made it to the train station _______ that I had left my ticket at home.
| A．have I realized | B．did I realize | C．had I realized | D．would I realize |
.He wen thome for lunch____the clock struck twelve.
| A．while | B．immediately | C．right away | D．atonce |
.Is this the very factory____he visited last month?
| A．which | B．that | C．where | D．in which |
The first thing____you should do is to learn all the new words by heart.
| A．what | B．that | C．which | D．who |
The students are talking about the strange people and stories ____ they met in the
adventure.
| A．that | B．which | C．what | D．whom |
It is not I but Mr.Green who____in charge of the company.
| A．is | B．am | C．are | D．was |