[ Modal Verbs ]
We __________ wash our hands before we have our meals.
A. should
B. must
C. can
D. might

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Grammar › ViewThe best way ____ London is by taking a guided tour.
A. of which to see
B. to see
C. seeing
D. in which you see
Grammar › View
If she had participated more in class,
A. she would have passed the course.
B. she would pass the course.
