_____, the boy couldn't enter his house.
| A．Since the key had lost | B．The key being lost |
| C．Lost the key | D．Having lost the key |
．Researchers from MIT, Harvard reported a study of human brains yesterday that may______ some new information for mental illnesses.
| A．create | B．provide | C．expect | D．imagine |
—Where was it ____ the earthquake broke out yesterday ?
—In an Italian city.
| A．where | B．which | C．how | D．that |
Marking "Earth Day 2009" with his plan for _____ energy．President Barack Obama on Wednesday called for energy exploration.
| A．alternative | B．traditional | C．available | D．inexpensive |
As a matter of fact, nearly everybody in the world would like to be ____ Bill Gates is, doing ____ he is doing.
| A．where; what | B．what; that | C．that; what | D．who; that |
They _____ of the terrible situation in Thailand, otherwise they wouldn't have gone there for sightseeing.
| A．wouldn't hear | B．didn't hear | C．haven't heard | D．don't hear |