11. These patients … tablets 3 times a day.
a) is taking c) takes
b) take d) are taken
12. I am surprised that you … speak English well.
a) must c) can
b) need d) may

13. Our classes … over at 3 p.m. yesterday.
a) were c) was
b) are d) will be
14. Last year there … 15 students in our group.
a) is c) were
b) are d) will be
15. Jane … lectures in Biology on Mondays.
a) had c) has
b) have d) is