One in five humans ___ access to safe drinking water by 2080．
| A．is said lacking | B．is said to lack |
| C．are said to lack | D．are said lacking |
By serving others，a person focuses on someone other than himself or herself，______ can be very eyeopening and rewarding.
| A．who | B．which | C．what | D．that |
Mr.Morse，who graduated from a famous medical university，spent years ______ his skills as a doctor.
| A．adapting |
| B．acquiring |
| C．occupying |
| D．concentrating |
He’s _______as a “bellyacher” —he’s always complaining about something.
| A．who is known | B．whom is known |
| C．what is known | D．which is known |
They are only children of not more than twelve and don’t realize_______to organize such an exhibition.
| A．when they take | B．what it takes |
| C．how they take | D．what takes them |
_______ makes the school famous is_______more than 90% of the students have been admitted to universities.
| A．What;because | B．That;because | C．That;what | D．What;that |