Internet is very useful. It can __________our eyes to the outside.

Nancy spent half an hour _______ playing the piano every day.

He made another wonderful discovery, __________ of great importance to science.

Excuse me, I want to buy some food. Where can I find a supermarket？ —I know ________ not far from here. You can easily find ________.

Why didn’t you answer my phone last night?–I ______ on my way home.