I’m afraid we can’t come, but thanks for the invitation_________.

They’re ______ choosing a cautious policy in order to avoid a risk in such an important event.

There is still much to discuss.We shall，______，return to this item at our next meeting.

Wang Ping hesitated for ___ before he ___ to the question.

 A woman in her 60s         gave birth to two test tube babies three years ago, after her only daughter died of gas poisoning.