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ward sister sarah brown is responsible for the welfare of 28 patients on two wards at london hospital where she (a1) … for the last 6 years. she (a2) … a staff of 12 people. there are also 15 students nurses who (a3) … to the ward at any time. it (a4) …, she says, that 200 people – doctors, nurses, students, visitors – (a5) … through her wards every day. sister brown, who is 39, (a6) … as a nurse 20 years ago.
a1. 1) worked; 2) was working; 3) had worked; 4) has been working.
a2. 1) directs; 2) is directed; 3) has directed; 4) has been directing.
a3. 1) assigned; 2) have been assigned; 3) have assigned; 4) are assigned.
a4. 1) has been calculated; 2) is calculate; 3) had been calculated; 4) calculates.
a5. 1) have moved; 2) is moving; 3) are moving; 4) moved.
a6. 1) were qualified; 2) was qualified; 3) qualify; 4) has been qualified.

We can see waves on lakes or oceans. Waves are energy, not water. It is energy that moves across the ocean's surface. Water particles ony travel ina a small circle as a wave passes. Usually, the wind provieds the energy.. A strong wind that blows for a long time over open water can create big waves. Sometimes, an earthquake under the sea creates huge amounts of energy suddenly. This travels across the sea very quickly, then slows and grows is height when it reaches land.

We call the top od the wave the crest and the bottom the through. The distance between the crest and the throught is the wave height, and the distance between one crest and the next is the wave length.

Waves stop when the wind stops giving them energy to continue. Otherwise, they can travel to the other side of the world. On rocks, waves break with force, and create a lot of foam and spray. Ona a beach, the sand or stones slow the bottom part of the weave, and the crest rises to a peak, then curls over the top - creating the 'classic' wave shape - and breaks on the shore.

Does Mrs Cooper eat in the restaurant every Sunday? 2. He always helps his grandmother in the coat. 3. They never eat very much. 4. It's seven o'clock and they haven't gone to school now. 5. Listen! Ben is playing his electric guitar. 6. Does he wash his car every Sunday? 7. The bell rings at seven o'clock every morning. 8. They always bring their aunt a tree for Christmas. 9. She is wearing a red pullover and black jeans today. 10. Our cat never jumps on the kitchen table. 11. Look! The men wear blue uniforms. 12. Curt always plays his guitar in the afternoon. 13. The taxi is waiting for them at the moment. 14. The boys are throwing snowballs at the girls now. 15 Is Mr Black walking into the classroom at the moment ?