—I bought this shirt for 35 yuan yesterday.
—It’s on sale today for only 29. You should have waited.
—Oh, really? But how ________ I know?
| A．would | B．can | C．did | D．do |
Teenagers _____their health because they play computer games too much.
| A．have damaged | B．are damaging |
| C．damaged | D．will damage |
The old couple have three daughters，_____ graduating from the same university.
| A．all of them | B．all of whom |
| C．neither of them | D．neither of whom |
_____ what would happen，none of them could find a way out.
| A．Left wondering | B．Having left wondering |
| C．Leaving to wonder | D．Having left to wonder |
Just as the clothes a person wears，the food he eats and the friends with whom he spends his time，his house _____ his personality.
| A．resembles | B．strengthens | C．reflects | D．shapes |
She didn’t mention her troubles to Mr. Li，who might have helped her ______.
| A．instead | B．either | C．otherwise | D．anyhow |