It' s a pity that there are many teenagers _____only on-line activity is chatting with their e -pals !
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.
Our English teacher is wearing a gold watch, ________are made of small diamonds
__________at the door before you enter the office,or you’ll be considered impolite