Ответ:

0 I usually walk to school but today/now I am going by bicycle.

1 She usually wears trainers but today she is wearing high heels.

2 He usually watches TV but today he is reading a book.

3 They usually wear blue shirts but today they are wearing green ones.

4 We usually go swimming but today we are having a picnic.

Ответ: 0. am going; 1. wears, is wearing; 2. watches, is reading; 3. wear, are wearing; 4. go, are having