The hottest continent, Africa has a lot of resources, ______ are still undeveloped.
| A．many of them | B．many of whom | C．many of it | D．many of which |
Was it because Jack came late for schoolMr. Smith got angry?
| A． | why | B． | who | C． | where | D． | that |
Grandma pointed to the hospital and said, "That's ______ I was born."
| A．when | B．how | C．why | D．where |
She'd lived in London and Manchester, but she liked______ and moved to Cambridge.
| A．both | B．neither | C．none | D．either |
A company ______profits from home markets are declining may seek opportunities abroad.
| A．which | B．whose | C．who | D．why |
It’s standard practice for a company like this one______ a security officer.
| A．employed | B．being employed | C．to employ | D．employs |