The sunspot came into its active stage, ____ that happens once every eleven years.
| A．one | B．it | C．the one | D．what |
I am very outgoing and have learned to my disability.
| A．adapt to | B．adapt from | C．adapt for | D．adapt with |
Claire thought it was ridiculous sympathy by a robot.
| A．to offer | B．to be offered | C．to be offering | D．to have offered |
There is no doubt the earth is becoming warmer.
| A．whether | B．that | C．if | D．why |
Using a telescope we could see that something .
| A．is happening | B．happened | C．would happen | D．was happening |
all day, I went to bed early.
| A．Working hard | B．Worked hard | C．Having worked hard | D．To work hard |