If it ________ for the heavy rain then, we would have arrived here ahead of time.
When he opened the box, it ____________ a bad smell.
Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.
We had a big meal in a fine restaurant last Monday and the total cost ____________ $500.
You’ve failed to do what you ___________ to and I’m afraid the teacher will blame you.
It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.