Plastic bottles ________ to hold flowers.(can/ design
can be designed
Electricity ________ to give power to cars. (can / use)
can be used
Energy-efficient bulbs ____________ at home.(should / use)
should be used
Trash ______________ in the trash can. (should / throw)
should be thrown
Class photos _________ on the school website. (might/post)
might be posted
Olympic medals ______ from recycled electronics. (might/make)
might be made
Surfing competitions ______ only when waves are big enough. (can/hold)
can be held
Trees ______ by elephants when searching for fruit. (might/push)
might be pushed
Big companies ______________ to protect the environment. (must / tell)
must be told
Helmets ______ by athletes in almost every contact sport. (must/wear)
must be worn
Lights ________________ off when not in use.(should / turn)
should be turned
Birthday cards ______ by classmates during lunch break. (can/give)
can be given
Fish ______ by octopuses using their arms like nets. (can/catch)
can be caught
Clownfish ______ from male to female during their lives. (can/turn)
can be turned
Homework _________ before the next class. (must/finish)
must be finished
Messages ______ by bees through dance. (can/send)
can be sent
Sports equipment ______ after PE class. (should/return)
should be returned
The environment ___________ by reducing pollution. (may / save)
may be saved