Match the numbers to the letters and write sentences using relative pronouns or adverbs: who, which, whose, where, when or why. Add that where possible. If relative pronouns or adverbs can be omitted, put them into brackets, as in the example. 1. c) 1928 is the year (when/that) Leo Tolstoy was born. 2. A laboratory is a room or a building 3. A stethoscope is an instrument 4. 1479 is the year 5. A workshop is a place. 6. A microbiologist is a scientist 7. A squid is a sea creature 8. The last time 9. This is the reason 10. An air-traffic controller is a person 11. A rhombus is a geometrical shape a) scientists do experiments or research. b) they divorced. c) Leo Tolstoy was born d) studies microorganisms and their effect on people. e) tentacles around its mouth help it to catch food. f) has four equal sides but is not a square. g) a person can make or repair things. h) a doctor uses to listen to one's heart and other sounds inside one's body. i) the Assumption Cathedral in the Kremlin was completed. k) job is to organise the routes which aircraft are allowed to take through the sky. j) I did a crossword puzzle was several years ago.