23. Every Monday morning, all the teachers and students in our school stand at ____ as our national flag is raised.
| A．attention | B．attentions | C．at ease | D．Attentively |
Our maths teacher set so difficult an examination problem ______ none of us worked out.
| A．which | B．that | C．as | D．so that |
This is the second factory, ______ I used to work, many workers of______ still have a good relationship with me.
| A．where, which | B．that, whom | C．which, which | D．that, which |
It’s impossible for him to escape ______ this time; he made such a big mistake.
| A．punishing | B．being punished | C．to punish | D．having punished |
The ______ look on the student’s face suggested that your ______ question made him ______.
| A．puzzling; puzzled; puzzled | B．puzzling; puzzling; puzzled |
| C．puzzled; puzzled; puzzling | D．puzzled; puzzling; puzzled |
Only ______ as an interpreter ______ how important it was to grasp English.
| A．when I worked; did I realize | B．when did I work; I realized |
| C．when I worked; I realized | D．when did I work; did I realize |