They took ________ measures to prevent poisonous gases from escaping.

A) from

B) in

C) before

D) into

A) neither

B) so

C) either

D) both

A.flat B.coined C.bored D.manufactured

A) by which B) to which C) in that D) so that

A) that B) which C) in which D) whose

A) which B) what C) that D) one

A) must be sent B) will be sent C) are sent D) be sent

A) have realized B) should realize C) realize D) realized

A) was not planned B) has not been planned

C) had not been planned D) were not planned