从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

He raised his arm to ________ his face ________ being hurt.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

If the river is heavily polluted, fish in it will be ________.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

The manager can't go abroad for a holiday at present ________ this unsolved problem.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

Although he had to spend lots of money to go to the ball, he accepted the invitation. ________, the ball was important.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

No one knows when such a custom first ________.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

He didn't ________ me though I had warned him that this lesson was very important.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

Reading Lu Xun's novels ________ great ________ me when I was a child.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

Due to the change in nature and people's crazy hunting,milu deer ________ gradually ________ in China.

从方框中选择合适的词组并用其正确形式填入下面的句子中，使句子的意思完整。

The boy is enough to ________ himself.

选择填空

How much money we should spend on endangered tigers ________ (is discussing, is being discussed) at present.