It is global warming, rather than other factors, _____the extreme weather.
| A．that has led to | B．which are causing |
| C．which has caused | D．that have led to |
He had a lot of friends, only a few of ______ invited to his wedding.
| A．whom | B．them | C．which | D．who |
I met the fruit-pickers, several of _______ were still university students.
| A．that | B．who | C．them | D．whom |
Her sons, both of ______ work abroad, will come back home this summer.
| A．that | B．who | C．them | D．whom |
George, with _______ I played tennis on Sundays, was a warm-hearted person.
| A．that | B．him | C．them | D．whom |
This I did at nine o’clock, after _______ I sat reading the paper.
| A．that | B．it | C．them | D．which |