I didn’t quite follow him because he explained the theory _____that is too abstract for me.
I tried to work on, but I was so tired that I could no longer _____ .
---Let’s go to the lecture on International Trade this evening. ---That’ s great. I’ll _____ you at 6: 30.
Chemicals in the body _____ our food into useful substance.
You may _____ studying English, but in the long run, you’ll be glad that you did.
David likes country life and has decided to _____ farming.