You must ______ a wide vocabulary if you want to learn a language well.

Life can be hard __________, but you must keep your head held high and stay positive. Never letanyone bring you down.

Li Hua’s parents hold different opinions on whether they should have ________ child.

The results of the study indicated that it was the type of fat ____ made the difference.[ ]

Great efforts to increase grain production if food shortages are to be avoided.