_______ a pair of compasses, it is easy to describe a circle.
_______ I went to the South Lake in Hanzhong, I was deeply impressed with its beautiful scenery.
Sheldon could have defeated Howard in the match, but he _______ too careless at the last minute.
Don’t call me up at this time tomorrow, for I _______ an important test.
It’s the third time that Li Ming has been to Xi’an , _______?
--Li Ping often watches _______ English TV news in her spare time. ---No wonder she has _______ command of English.