Would you please make up a topic worth______ at tomorrow’s meeting?

Go to bed right away．Don’t forget you need to get up as early as you can ______ the early train．

________ with some research materials, he decided on three possible approaches in his experiment.

________ to overcome the difficulty，he works day and night．

When he came back three hours later, they were still ____on the sofa, _____ in conversation.