check this exercise, please
Use verbals in the correct form.
In 1970, a team of scientists from Boston began (1 use) sonar (2 look) for Loch Ness Monster. Sonar bounces sound waves off objects (3 form) a picture of the objects by (4 collect) echoes. The sonar showed what seemed large (5 move) objects underwater.
(6 use) all the evidence available, the scientists considered Nessie a primitive whale (7 look) like a very large eel with a long, thick, snakelike body, its neck (8 be) long and flexible. The scientists thought that 90 per cent of the sights of Nessie seemed (9 be) false.
Meanwhile, different groups of scientists go on (10 search) for Nessie.
2) to look
9) to be