More than 68,600 foreigners are working in Shanghai.The number is 13 times ________ of 1996,when Shanghai started issuing expatriate work permits.
I waved to Nancy, but she was _______ in her thought, and made no response.
With ______ help of his teachers, he made ______ great progress in his study.
I _____ in the street when someone _____ me.
The number of people who _______ invited to the meeting _____ fifty, but a number of them _____ absent for different reasons.
The early pioneers had to _____ many difficulties to settle down on the new land.