If there are ______ trees, the air in our city will be _______ cleaner.

Can I join their club— I am afraid you will be refused __________ you’ve passed all their tests.

Whydon’t we choose that road to save time —The bridge toit __________

John thinks it won’t be long ____ he is ready for his new job

一Why do children hang stockings over the fireplace for presents?一As the story goes, to help a poor family, Father Christmas threw a small bag of gold down the chimney and it fell into a stocking that＿up to dry over the fireplace