He _______ for two years. We are still sad about his _______.

Can you work out the maths problem? —Sorry, I can ______ understand its meaning.

Is there _______ left in the fridge? —Only some eggs.

Would you prefer to attend a private tutor?—I’d rather _____ for a class than _____ a tutor.

The population of China is much ______ than that of ________ country in Africa.