Must/Have to/Need to/Should
Cooks ____________ wash their hands before they touch food. (rule)
must
Your brain _________ store information.
can
Your thumb looks infected. The doctor ____________ give you antibiotics.
might/may
The children are playing ____________. (happy)
happily
You must eat meat to get enough _______________.
protein
You ____________ eat more fresh fruits and vegetables. (advice)
should
Many years ago, doctors ____________ operate on people´s hearts.
couldn´t
She __________ want any lunch because she´s got an upset stomach.
may not/might not
Lily drives more _____________ (careful) than Paul.
carefully
The ___________ is shorter than the other fingers, but it plays a more important role.
thumb
He _______________ (have) share his lunch. He does it because he´s kind.
doesn´t have to
I run every day. Soon, I _____________ run a marathon.
will be able to
Sweat mustn´t / doesn´t have to / can be uncomfortable, but it should / must / may be one of the reasons for the survival of the human race.
can/may
Dan speaks less ______________ (quickly) his sister.
quickly than
Tom´s bedroom is very ______________. I can´t see the floor!
messy
You ____________ (need) cook the fruit. It´s good raw.
don´t need to
After I broke my ankle, I ______________ wear my shoe for a month.
couldn´t
A human´s body temperature has to/doesn´t have to/mustn´t rise high or the person might not/might/should become very ill.
mustn´t/might
John runs as ___________ (fast) me.
fast as
A person´s right _____________ holds more oxygen than the left one.
lung
_____________ a person be less selfish if they want more friends? (advice)
Shouldn´t
_____________ help me with my English project next week?
Will you be able to
After you had injured your hand, when were you able to/will you be able to/can write again?
were you able to
Tony wasn´t very nice today, but he usually speaks to people ______________ (pleasant) he did today.
more pleasantly than
Dan is very _____________. I know I can count on him to be responsible.
reliable