[ Grammar ]
The sun was thought _____ a ball of fire in the past, but now it is known _____ a glowing sphere of gases.
A. to have been, to have been
B. to be, to have been
C. to have been, to be
D. to be, to be

Random Topics:
Present Tenses and ConnectorsIdentify The TensesCOUNT - NONCOUNT NOUNSRelative Clauses and UsageDo not- Does notSimple Present and Simple PastModal and Modal PerfectArticles and NounsArticles with Proper NounsArticle the or zero article (-)Other quiz:
Grammar › ViewWe saw a homeless guy ___________ around at our school gate.
A. collect
B. wander
C. bully
D. fascinate
Tenses › View
My dad … a lot of tennis some years ago.
A. plays
B. played
C. is playing
D. was playing
Phrasal Verb › ViewLife is too short to put anything … until later. Do it now.
A. on
B. off
C. up
D. down
Grammar › View
We should teach our children creative and critical thinking so that they can ______ with life in the 21st century.
A. cope for
B. cope
C. cope up
