.Traveling by plane is the most comfortable ， but it is also the _________ .
| A．expensive | B．most expensive |
| C．cheap | D．cheapest |
I think it’s difficult to go _____the forest alone.
| A．across | B．through | C．though | D．cross |
Many students like reading the book Harry Potter_____by J.K. Rowling.
| A． written | B．was written |
| C．wrote | D．was writing |
It is a good way to keep both teachers and students_______.
| A．to happy | B． happying | C．happy | D． happily |
But none of the artists knew _____to make the King happy.
| A．when to do | B．what to do |
| C．how to do | D．where to do |
Now the traffic in our city is becoming ______.than before.
| A．much heavier | B．more heavier |
| C．much heavily | D．very heavier |