(2019原创)Some of my friends are interested in science, but they still can't know ________.
A.when UFO will appear again B.when UFO appears again
C.which UFO will appear again D.which UFO appears again
(2019原创)There are so many foggy days these days. We all want to find out________.
A.what we did to prevent it B.what we can do to prevent it
C.why we did to prevent it D.why we do to prevent it
- What beautiful photos! Can you tell me _?
- I took them in the Summer Palace.
A.where you took them B.where you will take them
C.where did you take them D.where will you take them
(2019原创)Peter says that the Whites are on holiday, but no one knows________.
A.when they have gone B.when have they gone
C.when they went D.when do they go
(2019原创)They want to go on a trip by train, but still can't decide________.
A.how they're going B.where they're going
C.why they're planning D.when they're planning
(2019原创)These little children don't know ________. They need to ask their mothers for help.
A.what their shoes are B.where are their shoes
C.how their shoes can be put on D.when they lost their shoes
