Choose the right answer.

We try to ____ some exercises every day.
do
make
have
Did you travel ___ bike or ___ foot?
by, by
on, by
by, on
I _____ not come to the lesson because I am ill.
may
must
might
I _____ sports twice a week.
do
make
try
You ____ need a special visa but I am not sure.
will
must
may