[ Grammar ]
Every night the watchman turns on all the lights and …around the building every half an hour.
A. walks
B. is walking
C. walked
D. to be walking

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Article the or zero article (-)Verb TensesAdjectives or AdverbsNouns FormationAuxiliary Verbs (be, do, have)To infinitive - GerundGrammar Present Perfect (ever never)Modals of ProbabilityGrammar - Present Perfect with for and sinceCoordinate ConjunctionOther quiz:
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. In the UK, many small companies have the letters ‘___________’ after their names. This means that the owners have limited liability.
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