You had better book rooms at the hotel in advance _____you should find no room on your arrival

Having worked abroad for several years, Janson wanted to settle down to a _________ job in his homeland.

________ it is to chat with our friends onthe Internet!

n tomorrow, we will not go outing.

He started to work dilligently _____ he came up with the idea of hybrid rice for the first time in the 1960’s