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

It was such a ______ to have spent a day withthe local family.

I’ll buy you a new watch if you learn to swim this summer.— Is there a ________ I’m sure I’ll get it.

You look sleepy today—__________ not to miss the flight，I didn’t dare to close my eyes the whole night

“I haven’t heard from Henry for a long time.”“What do you suppose_____ to him?”