1. You________ help Jack as his best friend, since he is now in trouble.

2.—________ I leave now, Miss White?

—No, you________ .You________finish the exercises first.

3. It’s 8 o’clock. Mr. Smith________be here at any moment.

4. You look tired. You________ have a good rest.

5.—Are you coming to the party?

—I________come, but I’m not sure.

6. I’d like to ask a question if I________ .

1. Life __________ the oceans ranges __________ the tiniest plankton all the way __________ __________ giants __________ sharks and whales.

2. The nutrients __________ whatever falls __________ the ocean will quickly become available __________ other living creatures.

3. Water can absorb and release a lot __________ heat __________ big changes __________ its temperature, thus creating a stable environment.

4. If the ocean is the source __________ life __________ earth, then the estuary is our planet’s nursery—a transition zone __________ the land and sea.

5. Estuaries provide both recreation and education __________ human beings. Estuaries also contribute __________ the economy __________ tourism and fishing.

1. __________ their efforts to survive, they find themselves __________ the surface of the monster itself, which turns out to a submarine.

2. __________ the end, their raft is drawn __________ a fast stream and __________ ever increasing speed and temperatures they are shot __________ __________ a volcano in Southern Italy.

3. My father was not scientific, so I had to look __________ a road__________ having a map.

4. I read all the books I could find that threw light __________ these matters.

5. I collected my instruments __________ me,__________ which I could light the flame of life __________ the dead thing that lay __________ my feet.

can, may, should, ought to, had better

1. You________ help Jack as his best friend, since he is now in trouble.

2.—________ I leave now, Miss White?

—No, you________ .You________finish the exercises first.

3. It’s 8 o’clock. Mr. Smith________be here at any moment.

4. You look tired. You________ have a good rest.

5.—Are you coming to the party?

—I________come, but I’m not sure.

6. I’d like to ask a question if I________ .

You’d better not eat the fruit that is________ (ripe).

Now it’s your turn to make a________ (decide).