The number of primary schools in the rural areas _____ doubling in the past 50 years.
The number of primary schools in the rural areas \_\_\_\__ doubling in the past 50 years.
动词
_____ uncomfortable it may be, proper protective gear absolutely must be worn by anyone using the equipment.
\_\_\_\__ uncomfortable it may be, proper protective gear absolutely must be worn by anyone using the equipment.
In the morning I got on the train, which arrived Shanghai at night.
In the morning I got on the train, which arrived Shanghai at night.
It _____ only last year _____ I made her acquaintance.
It \_\_\_\__ only last year \_\_\_\__ I made her acquaintance.
