18. ---- Are you free after school? ---- Sorry. I’ve planned to treat a friend of mine to dinner _______for his help.
The aged are close companions, and many of have known each other for decades.
The job market has changed and ourto finding work must change as well.
__________ the experiment right, I tried again and succeeded.
---When shall we meet your cousin at the station? ---His plane took off 2 hours ago, and it _________ arrive at 5pm.
A lot of research and studies have shown that Trench oil, taken out from kitchen waste, ______ the increase of cancers.