1. Belgium is not so big as France.
2. They have just met.
3. They had enought cache for a one-way ticket.
Some coniferous trees... - D
The Neighborhood Watch... - B
His boss... - B
The person... - D
I will be a doctor when I grow up.
Мы употребляем "will be", потому что мы говорим о будущем. Соответственно мы ставим глагол в будущее время.
Вилы транспортов* a car , a helicopter, a plane, a train, a tram, a bus, a trolleybus, a bike, a ship, a boat