This book is ____ hard ____ understand.[ ]

It’s too hot today. Please give a bottle of orange.

This is the very reason ______ he gave for his coming late to the meeting.

The 3-month-old baby cried from time to time last night. His parentshad a good sleep.

After a series of food safety incidents, the government has ______ that not enough has been done to guarantee people green and healthy food.