I ______ have been more than six years old when the accident happened.
A lot of people ______ the theory that acupuncture can produce chemicals in the body which reduce pain.
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.