It sounds like a good idea, but it _________ to be seen whether it will succeed.
The number of people in the world__________ about 6 billion and large quantities of waste ____ each year.
When the movie Twilight __________, it topped best-seller lists for many months.
---- Mary quitted the job again last week.---- Why did she do a thing like that? It seems to make no__________.
.You can have _________ second try if you fail______ driving test this time.
---How long are you staying? ---I don’t know. ___________.