1.I think there _____(be) fewer trees next year.
2.He _____ (collect) 300 pictures since 5 years ago.
3.Sam always _____(help) his classmates.
4.Would you mind _____ （play）the games after school？
5.My father came into the bedroom while I ____ (dance)
6.American fast food seems_______ (be) the most popular in the world.
7.My mother made me ______(clean) my room all by myself yesterday.
Most of people in the United States speak English．There are over 6，000 languages spoken all over the world．You know that every language has its own words. When you want to learn a foreign language，you must learn its words．You must know what the words mean，and you must say them in the right way．Words are made up of sound，and different languages have different sounds．There are thousands of language sound．When you speak English，you are using only about fifty of them．
Some languages are spoken faster than others．English is spoken more slowly than French．Women speak faster than men．In America，women speak about 175 words every minute，but men speak about only 150．How many words do you speak every minute？
1．What language do most people in America speak？
2．How many languages are spoken all over the world？
3．Does Chinese have its own words？
4．Do we often use forty-eight of the sounds when we speak English？
5．Who speak faster in the U. S. A， men or women？
1.will be 解析：句末明显的时间标志，next year，应该用一般将来时，will+动词原形。
2.has collected 解析：这是现在完成时很经典的句子，由since引导时间状语或是时间状语从句。更常考的是，since加过去时的句子，主句用现在完成时的情况，比如说：He has lived China for 4 years sice he moved here in 2005.
4. playing 解析：would you mind +doing sth，动词的这类用法需要不断积累和归纳。
5. was dancing 解析：本题中的状语从句由while引导，强调的是同时性，应该用进行时，由于主句中用了过去时态，后文应对应的使用过去进行时。
6.to be 解析：固定用法，seem to，好像-后面直接跟动词原形。
7.clean 解析：本题考查使役动词make的用法，make sb do sth。更有难度一点的题应该是考查使役动词的被动态，应该是be made to do sth.
3.Yes， it does.
4.No， we use about fifty of them.