The scientists wanted to keep people ________ about the breakthrough in their experiment.

A) from which

B) on which

C) in which

D) for which

A) have completed

B) complete

C) am completing

D) will have completed

A) unless

B) while

C) before

D) once

A) which

B) what

C) that

D) how

A) arrange

B) to arrange

C) have arranged

D) arranged

A) meet

B) meeting

C) be meeting

D) having met

A) whose

B) what

C) which

D) that

A) took place

B) take place

C) will have taken place

D) have taken place

A) if

B) what

C) that

D) which

A) that

B) who

C) as

D) which