6 Complete the sentences with proper complex modal verb forms. Nigora and Temur have been doing research work in chemistry for about five years. They tired after hard work

6 Complete the sentences with proper complex modal verb forms. 1. Nigora and Temur have been doing research work in chemistry for about five years. They tired after hard work. 2. A lot of problems in heating system oсcur at this old house regularly, special measurements based last year. airplane out of fuel; B it can be filled with it even in the air nowadays. 4. The popular sports competition organization on science 3. This latest 'model of Formula interested in holding sports car competition with electro mobile cars. 5. These superebots a wrong calculation. 6. The latest models of ultra books are really able to comprehend any owner's orders by their brain moves; scientists at development in this sphere.