_________, the subject belongs to biology.

When we got there, he was about to leave. So he only had time to explain _______ to us how he ________ our plan.

—Hi, I hear you’re going to London this summer vacation.
—            , I was going to, but now I have changed my plan.

After ten years abroad, he still recognized his old colleagues ________ he set foot in China．

---How did you find the albums ’ Music Voyager’ and ’Heaven’ by JJ Lam?
--- Wonderful. It’s ____ worth ________.

I can’t finish this job by Friday. You expect too much of me.

The man should be excused because he caused the damage _______．

— Do you know the reason why the Whites got divorced?
— No, they haven’t quarreled with each other since they got married. _______, they broke up finally.

I recognized the man _______ he came into the room.

The second-hand car David bought the other day is as good as new; ______ it is in excellent condition.