6.You should wash the fruits _______________ before eating them. (care) 7.The ____________of the video games become very rich. (invent) 8.You must be _________ when you cross the busy streets. (care) 9.She never touched ____________food. (health) 10.Clean teeth are _____________ teeth. (health) 11.Last year, there was a district walking ________ for school children. (compete) 12.The number of _________ increases every week. (participate) 13.The _____ was so exciting that all the spectators stood up to watch. (compete) 14.Alexander Graham Bell _________ the telephone. (inventor) 15.There are ten ____________ in the race. (compete) 16.There is one thing you need to ___________. (improvement) 17.We can learn more about the undersea world thanks to Jacques Cousteau’s _____. ( invent) 18.___________ say that life started in the ocean. (science) 19.We were very __________________ at the intelligence of your sister. (surprise) 20.Everything had been ready before ______ arrived. (participate) 21.Their ______ in our project is meaningful. (participate) 22.All _________ must wear a number in the race. (compete) 23.His answer made me ________________. (surprise) 24.Now, We can __________ the oceans, using special TV camera as well. (exploration) 25.Which ____________ discovered American? (explore) 26.The accident happened because of ______________ driving. (care) 27.Please listen to your teacher _______________. (care) 28.She actively________________in social work. (participation) 29.There is some _______________ in his speaking English. (improve) 30.She was very______________ at the exam result. (surprise)