Everyone _____ do his best to make the world safe and clean.
| A．can | B．may | C．should | D．hadto |
---I need to advertise for a roommate for next term.
---_______ ? Mary is interested.
| A．Why bother | B．Why not | C．So what | D．What for |
Care of the soul is a gradual process ______ even the small details of life should be considered.
| A．what | B．in what | C．which | D．in which |
With his eyes ________ the work attentively, he didn’t know what was happening outside.
| A．focusing on | B．focused on | C．fixing on | D．to fix on |
The poor woman had not slept all night and was completely _________.
| A．burnt out | B．reached out | C．watched out | D．turned out |
________ they are my neighbors, I don’t know them well.
| A．While | B．Despite | C．As | D．Now that |