Ответ:

1. Б - ушёл.

2. Б- проработал

3. А- разработал.

1. Bob is not here. He's gone to work.

Ответ:b.ушёл

2.He's worked here for 10 years.

Ответ:а.работал

3.Bob is a good designer. He has developed many new products  so far.

Ответ:а.разработал