2．She will spend as much time as she can __________(practise)speaking English．

1．Look！Someone __________ (clean)the room．How clean it is！

10．Ann has made great__________(进步)recently．

9．I__________(不知道)if the teacher will come tomorrow．

8．A lot of meetings were put off because of the__________(危险的)disease．

7．It is __________(必要)to learn English well．

6．Pollution is a__________(严重的)problem．Scientists have come up with some good ways to solve it．

5．Trees and flowers are planted every year to make our country more b__________．

4．Now stop writing and listen to me c__________．

3．There are n__________ 34 million people living here．