[ Present Verb Tenses ]
I ______ (not/understand) why he ______ (always/complain) about his job.
A. don’t understand, always complains
B. don’t understand, is always complaining
C. don’t understood, always complained
D. don’t understood, is always complaining
Select your answer:

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Gerund › ViewI still can’t get used …. early.
A. to waking up
B. wake up
Modals › View
Choose the best modal to complete this sentence:
My tooth is aching. I ____ go to the dentist to have it checked.
A. must
B. have to
C. need to
D. should
