用所给动词的适当形式填空。
There ______(be) many people at tomorrow’s party .
We all ______(take )part in the sports meeting last week .
Listen , who ______(sing) in English ?
He _______（be）fifteen next week .
-_______ they ______ (buy) the house ?  - Yes ,they will .
We are sure Hong Kong will be even ______ (good )tomorrow.
There will be ______ (few) trees in the future .
People will live ______ (be) 200 years old .
There will be ______ (many) people in 30 years .
The children will use computers ______ (study)at home.