Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

There is no need ______(pretend) to know what you don’t know.

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

What ______(happen) if I drink this.

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

You cannot leave until you ______(do) your work.

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

It rained yesterday after it ______(be)dry for many months.

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

I saw him just now.He ______(be)ill now.

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

She ______ courage to do it well.(lack)

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

Xi’an is an ______ city,well known not only in China,but in the world as well.(ancients)

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

The world will be short of food with the population ______.(grow)

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

He was ______ by his failure to pass the final exam.(shame)

Fill in the blanks with the given words in their proper forms(用所给单词的适当形式填空，每空格限填一词)：

This new photographic paper has its ______ built in.(chemical)