Choose the right answer.

We try to ____ some exercises every day.
have
do
make

Did you travel ___ bike or ___ foot?
by, by
on, by
by, on

I _____ not come to the lesson because I am ill.
must
might
may

I _____ sports twice a week.
make
try
do

You ____ need a special visa but I am not sure.
must
will
may