__________ of time and energy has been spent in investigating the murder.

has your father been staying in Jiuzhaigou—For two weeks.— will he be back—In two days，I think.

lm The Founding of a Republic iswonderful because about 80 stars appear in it, some of ________ areworld-famous.

Let Tom _____ right away.

______________ we wear, our family and friends may accept us, but the workplace may not