Rather than ______on a crowded bus, he always prefers _______a bicycle.
It’s more than half a century ________ my grandfather joined the Party and became a servant to the people.
We ________ the project on time without your timely help .
You________ the work better, but you didn’t put more efforts to it.
The professor you referred to in the letter______ us students three lectures by next Monday.
—What do you think has caused his heart attack? —It is ______.