Supply the correct forms of the words given in brackets to complete the sentences.
33.There are some ways to____works quickly. (memory)
34.Cheese,butter and yogurt are dairy_____. (produce)
35.Because of this volcanic______,the year 1816 is known as "the year without a summer" with colder weather and snow in the summer. (erupt)
36.Sam____me to go to a concert last Saturday. (invite)