Carbon dioxide，which makes a________between us and the sun，prevents heat from getting out of the atmosphere easily，so the earth is becoming warmer.
| A．difference | B．comparison |
| C．connection | D．barrier |
_______ restoration of ancient architecture, the Chinese government has invested a large sum of money on it.
| A．In case of | B．In favor of | C．In terms of | D．In honor of |
I think this is the very work that we must finish ____ her.
| A．to help | B．help |
| C．helping | D．helped |
The work he devoted his time to _____ worth praising.
| A．was | B．be |
| C．being | D．been |
The little girl who got lost decided to remain _________she was and wait tor her mother.
| A．where | B．what | C．how | D．who |
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |