Knowing a foreign language is necessary. - ................................................................................................................................. 3. Swimming across the river is dangerous. - ................................................................................................................................. 4. Doing that exercise is not difficult for us. - ................................................................................................................................. 5. Seeing you again is very nice. B. spreading program by telephone. D. not using shared software. C. a disk. D. a microbe It + Be + Adj (forsomeone) +To V1 Page 33 - ................................................................................................................................. 6. Doing morning exercise is good for us. - ................................................................................................................................. 7. Smoking cigarettes is harmful to our health. - .............. ................................................................................................................... 8. Being punctual is a good habit. - .................................................................................................................................. 9. Doing such a thing is a waste of time. - .................................................................................................................................. 10. Earning a lot of money to support the family is a big problem for him. - ............................................................................................................. giúp vs ạ