The lack of eco-friendly habits among the public is thought to be a major _____of global climate change.

The little boy just begins to speak English.He goes to great　　to say the sentence　　　full length.

 It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.

She is making herself ill with _____ over her son's future.

（天津市河东区201 4年高三二模考试）2. lf you live in the country or have ever visited there, ____are that you have heard birds singing to welcome the new day.【考点】考察固定句式