—What do you think of teacher,Bob?—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
There used to _________ a truck _________ and I can't get through.
He _________ live in the country ;but now he has _________ in the city.
No matter how low you consider yourself, there is always someone _________ you wishing they were that high.
Would you please __________ the paper for me and see if there are any obvious mistakes?
It rained heavily in the south,__________ serious flooding in several provinces.