4.Fill in the gaps with can/not , must/not or should/not.
a) Chidren _____ obey their parents.
b) My father ____ speak 4 foreign languages.
c)You ____ do your homework at night , you ____do it after lessons.
d)I’m not sure if Ben ______ help you with this. But I think your mother ______ know how to solve this problem.
e) He ____ go, because his leg is broken.
f) You ____ eat too much sweet ; otherwise your teeth will be spoilt.
g) Mike ____ read a lot if he wants to pass this exam.
h) One ____ play with electricity . It’s dangerous