Animals can become unusually ________ when they are upset by a sudden environment change.

“Do you like being married?”“Yes, but I＇m not used _______ every night.”

- Does he speak English or Russian? - He doesn＇t speak_________.

________ difficult the situation was, we managed to survive.

______ difficulties we may come across, we＇ll help one another to overcome them.

China has been following the foreign policy to develop relations with other countries on the _______ of the five principles of peaceful co-existence.

Charles Dickens __________many wonderful characters in his novels.

Carol made a ________ to work hard at school this year.

By the time he arrives in Beijing, we ________ here for two days.

By Saturday, I _______ here for three weeks.

Before I can give you an estimate,I must _______ the amount of material required.