My friend was (make) (16) (pay) (17) back the book.
Hardly (he/take) (18) up the book when the phone (ring) (19) .
Can you imagine what I (come) (20) across when I (roll) (21) up the carpet yesterday?
She might (win) (22) the prize, because she (write) (23) very well.
He resented (ask) (24) (wait) (25) . He had expected the minister to see him at once.

I live in a house near the sea. It is (26) old house, about 100 years old and (27) very small. There are two bed room s upstairs (28) no bathroom. The bathroom is downstairs (29) the kitchen and there is a living room where there is a lovely old fire place. There is a garden (30) the house. The garden (31) down to the beach and in spring and summer (32) flowers every where. I like alone with my dog, Rack, but we have a lot (33) visitors. My city friends often stay with (34) . I love (35) house for many reasons: the garden, the flowers in summer, the fee in winter, but the best thing is the view from my bedroom window.

A pilot cannot fly by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300,000 kilometers in one second. A radar set sends out a short burst of radio waves. Then it receives the echoes produced when the waves bounce off objects. By determining the time it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word “radar”, in fact, gets its name from the term “radio detection and ranging”. “Ranging” is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms.