[ Tenses ]
The teacher ____________ many times but they still don’t understand.
A. has explained
B. will explain
C. is explaining
D. explain

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Modal Verbs › ViewTerry and Frank said they would come over right after work, so they_____________ be here by 6:00.
A. have to
B. should
C. can
Grammar › View
She´s got ____ important to tell you.
A. something
B. anything
C. nothing
D. everything
Grammar › ViewIt doesn’t pay to resort on / in / to / with tough measures.
A. in
B. on
C. to
Grammar › View
She has been working for this company ___ 20 years.
A. since
B. for
C. yet
