If you have any questions,please____your hands.The students were busy____their lessons for the test.preparingpreparing forto prepareto prepare for
问题描述：
If you have any questions,please____your hands.
The students were busy____their lessons for the test.preparing
preparing for
to prepare
to prepare for
答
If you have any questions, please_put up___your hands.
The students were busy__preparing__their lessons for the test. preparing
preparing for
to prepare
to prepare for
答
put up
preparing for
be busy doing sth 忙于做某事
be prepared for 为……做准备
答
put up 举起（ 你的手）
preparing for ( be busy doing sth 忙于做某事)
答
put up your hands 举起你的手
preparing for be busy doing sth 忙于做某事