Ⅰ.单句语法填空
1．The climber was on the point of death ________ they found him.
2．It rained heavily，________ (cause) severe flooding in that country.
3．I am sure to cure you ________ your disease.
4．They were presented ________ flowers on arrival at the airport.
5．Last year he was chosen to attend a conference of ________ (advance) workers.
