---When do we need to pay the balance?
--- ____ September 30.
| A．In | B．By | C．During | D．Within |
I’m in the afternoon. We can discuss our plan for our summer vacation then.
| A．available | B．convenient | C．absent | D．qualified |
Sam felt he had nothing to the discussion, so he left early.
| A．belong to | B．lead to | C．adapt to | D．contribute to |
Imagine how excited we werethat our daughter had been employed by the well-known company.
| A．learning | B．to learn | C．having learned | D．to be learning |
—That must have been a pleasant experience.
— yeah, we ourselves.
| A．have been enjoying | B．enjoyed |
| C．were enjoying | D．had enjoyed |
time tomorrow, I would teach you how to play the piano.
| A．Had I had | B．If I would have | C．If I have | D．Were I to have |