1) Penguins are birds but they can not ___. In some jungles, there are frogs that can ___  between the trees.  a) flew b) flying c) fly 2) When you are in the library, you ___ to talk quietly. a) has b) having c) have 3) When you come to the road with many lorries on it, you ___ to be very careful when you cross the road. a) have b) must c) could 4) Fish are good to eat. But we must ___ careful not to take too many fish from the sea because in some parts of the world, there are not a lot of fish now.  a) are b) be c) being 5) You ___ to drink much water every day. a) can b) need c) must 6) You shouldn't eat junk food to stay healthy. a) eat b) eating c) ate

Movers R&W Part 4 - 5. Modal verbs

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