Which sentence is written correctly?
A. You may not enter Mr. Harris’s office without permission.
B. You may not enter Mr. Harris’ office without permission.
C. You may not enter Mr. Harris office without permission.
D. You may not enter Mr. Harris’es office without permission.

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ComparisionLinking Verbs and TensesPhrasesUncountable NounsGrammar - could / could notPassive Voice with ModalsAdverb of TimeIndefinite and Reflexive PronounsPRESENT SIMPLE vs PRESENT CONTINUOUS + QUANTPresent Perfect and Present Perfect Progressive TensesOther quiz:
Quantifiers › ViewThe 80% of European countries have a good economy.
A. a lot of countries has a good economy
B. Nearly all european countries have good economy
C. Not many european countries have good economy
D. no one
Grammar › View
Which sentence is punctuated correctly?
A. Petey my pet snake has only bitten one person.
B. Petey, my pet snake, has only bitten one person.
C. Petey, my pet snake has only bitten one person.
D. Petey my pet snake, has only bitten one person.
Please come here and look at _________ picture.
A. this
B. that
C. these
D. those
Past Continuous Tense › View
Joseph ________________ (ride) a camel for the whole morning yesterday.
A. were riding
B. are riding
C. was riding