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1. She always rides the same kind of bike ____ her twin sister does.
A) that    B) which    C) as   D) what

2. ____, I ’d have done it myself.
A) If I knew it            C) Had I known it
B) If I had have known it      D) Should I known it

3. The sun’s appearing to rise in the east is ____ the revolution of the earth on its axis from west to east.
A) owe to   B) due to   C) as to   D) as for

                            4. It was because she was too inexperienced ____  she        didn’t know how to deal with the situation.
              A) so that   B) that   C) that is why   D) so