—Did he come back late last night? —No.It was not yet eight o'clock _____________ he arrived home.
The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
Between the two roads ______a TV tower.
_______I toured the Great Wall, I was deeply impressed with the beautiful scenery.
-----Why are you looking pleased? ----Oh, I’ve just had a job _________.
As is known________ us, the actress is known________ her excellent acting