__ an old worker, so he knew exactly what to do.
| A．Being | B．Having been | C．As | D．He was |
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |
She is very dear to us. We have been prepared to do it takes to save her life.
| A．whichever | B．however | C．whatever | D．whoever |
What the boy enjoys _____ to have a room of his own.
| A．being | B．to be |
| C．is | D．are |
_________ he is, he has a wide range of knowledge.
| A．Although a child | B．While child | C．Child as | D．A child as |
_________ he is, he has a wide range of knowledge.
| A．Although a child | B．While child |
| C．Child as | D．A child as |