Our milk powder is especially suitable for children under 6, as it helps a lot to build the body's natural ________.
If _____ without following the doctor’s instructions, the medicine may have serious side effects.
The Chinese government has promised to do ______ lies in its power to ease the pressure of high housing price for average-income families.
He volunteered to work in a remote mountainous village in West China last year, which is still _____ on foot now.
– How did Mary react to the bad news?– Oh, she was filled with sorrow and ______ a sigh.
He was about half through his meal ______ a familiar voice came to his ears.