It is said that the gravity on Mars is only about __________ of the gravity on earth.
-Do you hear there was _______ fire in the shopping mall last night?- Yes. I never thought _______ fire can be so terrible.
---Excuse me. Can I take a seat here? ---__________. The woman who sat here will be back soon.
---Can you tell me ______________? ---His home is quite far away from the office, I think.
I’ve become good friends with several of the students in my school __________ I met in the English speech contest last year.
Mr. Smith works with a mobile phone company, but he _____________ for this international meeting, since he is on holiday.