Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years _________ it has warmed in the 20 000 years since Ice Age.
John is a lazy student,one of_________ bad study habits is to leave for tomorrow_____ ought to be done today.
A new technique_________, the yields as a whole increased by 20 percent.
Take this medicine,_________ you will be getting worse.
The boy was seen_________ in the examination and was punished by the teacher.
Switzerland refused to_________ the two world wars.