We used to see each other ________,but I haven't heard from him since last year.(2012·辽宁)
Smiles around the world _____ be false, ______ other feelings like anger, fear or worry.
From the _____ expression on her face, we knew that she was very _____ with the result.
—Who will you ______ to write the article? — ______ fits for the job.
There is no possibility ______ all the students can pass the college entrance examination.
More wild tigers have been seen in the forest around this area, ____ there used to be very few.