You must _____ a wide vocabulary if you want to learn a language well.
For miles around me there was nothing but a desert, without a single plant or tree ______.
More and more people choose to shop in a supermarket as it offers a great ____ of goods.
So difficult ______ it to live in an English-speaking country that I determined to learn English.
For a moment nothing happened. Then ______all shouting together.
—How long are you staying? —I don’t know. ______.