Test 1
Twenty years ago，Mark Thatcher，the son of Mrs．Thatcher，was reported missing in the Sahara Desert while competing in the Grand Prix Motor race from Paris to Daker．This sad news，so unexpected，shook the unusually calm and __1__ politician off her balance．Though she did her best to __2__ as if nothing had happened and made her public appearance as usual，people could not fail to notice that she was no longer the old selfassured prime minister who always had everything under __3__．Instead she had become a very sad mother who was unable to __4__ from her shock．
