We prefer Chi nese bicycles  __ Japa nese bicycles  ___ their fine quality.

Imports will be allowed in proportion _______ exports.

We cannot _____ the country ’ s telecommunications to unqualified people。

0w ing ____ unu sual shortage of stock, this offer is made, subject to the goods being un sold.

We will ______ you as soon as the new crop comes to the market.