The group’s research has done much to our knowledge of the HIV virus．
| A．advance | B．pull | C．rush | D．adopt |
Along the way, students _______ school uniforms stopped to look at us when we were cycling on campus.
| A．dressing in | B．dressed in |
| C．wore | D．wear |
I am fond of my sister but she has one serious shortcoming. She _______ be really impatient.
| A．may | B．must | C．can | D．should |
---Can I smoke here?
---Sorry. We don’t allow _______ here.
| A．people smoking | B．people smoke |
| C．to smoke | D．smoking |
Only by increasing the number of doctors by 50 percent _______ properly in this hospital.
| A．can be the patients treated |
| B．the patients can be treated |
| C．can the patients be treated |
| D．treated can be the patients |
--- So you didn’t say hello to Miss Wang last night?
--- Well, I stopped and smiled when I saw her, but she _______ me and walked on.
| A．refused | B．denied |
| C．missed | D．ignored |