Every student as well as all the teachers ____ required to be at the bus station at 6:30 tomorrow.
Before you make a decision, you should _______ the advantages and disadvantages carefully.
Farmers in poor areas cannot afford to ________ a doctor when they get sick.
Don’t be joking! I just _________ what I said.
Can you give me a reason to ___________ you absense yesterday?
A number of foreign guests were invited to the party, but 20 of them didn’t___________.