Although insects are harmful to plants, their existence contributes a great part to____which helps to make a balanced environment

1. Although insects are harmful to plants, their existence contributes a great part to____which helps to make a balanced environment

A. Biology

B. Biophysics

C. Biosphere

D. Biodiversity

2. ____a vacation now if she had more time?

A. Will she take

B. Would she take

C. Is she taking

D. Does she take

3. _____yet?

A. Was the report written

B. Has the report written

C. Did the report write

D. Has the report been written