IV. Give the correct tense or form of the verbs in brackets. 1. She (work) _____________ as a fashion designer since she left the college. 2. Look! The bus (come) _____________ 3. Jane(send)_____________ me a lot of letters last year, 4. If we pollute the water, we (not have) ____________ fresh water to use. 5. It is necessary (protect)_____________ forests. 6. You should learn how (keep)__________ the environment clean. 7. That bridge (build)___________in 1960. 8. What would you do if you (see)___________a UFO? V. Use the words given in brackets to form a word that fits in the space. 1. If at first you don’t ________, try again. (success) 2. My children are very ________ about their summer vacation. (excite) 3. Butter and cheese are milk__________ (produce) 4. She’s so busy with ________ activities that she has no time for entertainment. (society) 5. Mai had an_______ holiday in Nha Trang last year. (enjoy) 6. Tet is the most important________ in Viet Nam. (celebrate)