---I am sorry to have kept you ___________.
---It doesn't matter. I've just come.
| A．wait | B．waited | C．waiting | D．to wait |
_______ bottles of water do you want?
| A．How much | B．How many | C．How | D．What |
It’s very hard ___________the swimming pool.
| A．to swim across | B．to swim cross | C．swim across | D．swim cross |
The music __________, I want to listen again.
| A．sounds well | B．sounds good | C．sounds bad | D．is sound nice |
They will not start the work _______ their teacher comes back.
| A．while | B．until | C．as soon as | D．if |
There are some flowers on ___________ side of the road.
| A．each | B．every | C．both | D．all |