By 2150 the rainforests _______ and there won’t be enough oxygen for everyone.
A. have disappeared
B. will have disappeared
C. disappeared
D. will be disappearing

Random Topics:
Present ContinousPresent Simple/AffirmativePassive Voice of TensesModals of Obligation & ProhibitionPrepositions of Time and PlaceModals and Active and Passive VoicePrepositions after VerbsSentences vs Run-OnsConjunctive AdverbPresent Simple & Present ContinuousOther quiz:
Mixed General Quiz › ViewThe product didn’t work in the States. As they say there, it really ___ .
a. back to the drawing board.
b. bottlenecks
c. bombed
d. blow-by-blow
e. bottom line
IELTS Grammar › View
The court ________ him to five years in prison
A. sentenced
B. ordered
C. sent
Grammar › ViewWhich sentence uses a semicolon correctly?
A. Ms. Rodriguez stepped up to the podium, then; she delivered her speech.
B. The educational conference was sold out; in other words, every seat in the room was occupied.
C. Regina, a secondary teacher, Dae-jung, a principal; and Imani, a psychologist, organized the conference.
Adverbs of Frequency › View
During summer holiday Ann goes swimming twice _______.
A. a day
B. on a day
C. at a day
D. of a day
