It was only after I came across that matter_______ how important it was to master a foreign language.
| A．did I realize | B．had I realized |
| C．that I realized | D．when I realized |
After a year, doctors diagnosed him with a disease so rare ________ it affects just one in 8 million children.
| A．after | B．that | C．as | D．since |
________ you need something, please don't hesitate to let me know.
| A．Even though | B．In case |
| C．As though | D．Even if |
One more week, ________ we will accomplish the task better.
| A．or | B．but | C．unless | D．and |
He never thought that his success came ________ he least wanted it.
| A．until | B．since | C．when | D．while |
I was completely terrified when I suddenly saw a dark figure leaning ________ the door in front of me.
| A．in | B．to | C．against | D．by |