—Have you ever watched Friends?
—Yes. I ________ it three times when I was in college.
| A．have watched | B．watched | C．had watched | D．watch |
It is high time that we started to consider what ________ we should take to reduce heavy smog caused by traffic fumes and other pollutions.
| A．affection | B．attention |
| C．measures | D．advantages |
________ walk is expected to last all day, so bring ________ packed lunch.
| A．A; a | B．The; / |
| C．The; a | D．A; / |
In recent years, many mainland residents have rushed to Hong Kong to buy baby milk powder due to their ________ about its quality.
| A．anxiety | B．curiosity |
| C．generosity | D．attention |
One hundred thousand years ago, ________ choice was simple when it came to ________ drink—there was no choice. It was water or nothing.
| A．the；a | B．a；不填 |
| C．the；不填 | D．a；the |
Liu Yang is ________ first woman astronaut in China who reached ________ space.
| A．不填；the | B．the；不填 |
| C．the；the | D．a；a |