Conditions_____ farm to farm, so the experiment results are not reliable.
A. vary from
B. change
C. differ
D. varies from
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Ms Li, our English teacher, __________ arrived at the classroom for her bag are already on the desk.
A. may not have
B. must have
C. should have
D. could have
Harry is feeling uncomfortable. He _________ too much at the party last night.
A. would have drunk
B. should drink
C. could drink
D. must have drunk
When the taxi driver started to_____________ him, he walked off.
A. swear by
B. swear at
C. swear off
D. swear in
My dad has been ____ __these vitamin pills.
A. swearing in
B. swearing at
C. swearing off
D. swearing by