1 . Can you imagine ________ the work all by hand?

A．doing

B．to do

C．did

D．do

2 . By________ (support) new business models, such as online education and livestreaming, our country has achieved success in boosting the economy. (所给词的适当形式填空)

3 . Bill had done everything he could ________ to me.

A．avoid talking

B．to avoid talking

C．avoid to talk

D．to avoid to talk