[ Grammar ]
When do we use: ‘on’?
A. Months, seasons, years, centuries, etc.
B. Precise Time
C. Days, dates
D. All above

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Farther vs. Further › ViewIt always makes me think … back into the past.
(a) further
(b) farther/further
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___________ it rained heavily, we enjoyed our holiday.
A. Because of
B. Because
C. Despite
D. Though
Vocabulary › Viewa group of two or more atoms that form the smallest identifiable unit through chemical bonds
A. atom
B. element
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. Why does the author compare space exploration to the Lewis and Clark journey?
A. to describe how the explorations were different
B. to give an example of earlier space explorations
C. to show that explorations are dangerous
D. to demonstrate the idea that space exploration brings opportunities
