Actions __________ walking and drinking are quite difficult in the moon

More highways have been built in China, _____ it easier for people to travel everywhere.

The melon the Smiths served at dinner would have tasted ________ if it had been put in the fridge for a little while.

Film has a much shorter history, especially when _____ such art forms as music and painting.

He can _________. He wants to join the art club.