19.They talked about things and persons ___ they remembered in the school.
| A．who | B．which | C．that | D．what |
Mom, don’t you think it's OK to play once in a while it doesn’t affect my studies?
| A．even if | B．unless |
| C．so that | D．as long as |
The scientist spent years alone in the forest, ______ by eating wild fruit and small animals.
| A．surviving | B．survived |
| C．to survive | D．having survived |
—Wow, you have a really good voice. I_____ you were good at singing.
—Thank you.
| A．haven't known | B．hadn't known |
| C．didn't know | D．don't know |
The main street is lined with small stands and shops _____ sell almost anything you can imagine.
| A．what | B．where | C．who | D．which |
To my great disappointment, my best friend left the city I could have a word with her.
| A．before | B．after |
| C．while | D．until |