Several companies are competing _____ each other for a contract(合同) [ ]

________to the man’s timely coming, the________boy was saved. [ ]

Everything was perfect for the picnic the weather

The president of the World Bank says he has a passion for China, ______ he remembers starting as early as his childhood.

he iPhone first the market, only die-hard Apple fans bought it. But today, iPhones are everywhere.