--- Whose shirt is this?
--- It _______ be Li Lei’s. It is too big for him.
| A．could | B．must | C．can’t | D．might |
They were________their invention．They thought they could invent more things to make our life easier．
| A．angry with |
| B．proud of |
| C．strict in |
| D．tired of |
Thank you for helping me a lot．I am________to you．
| A．patient |
| B．interested |
| C．thankful |
| D．bored |
The students are full of energy．They are thirsty ________knowledge．
| A．with |
| B．for |
| C．as |
| D．on |
—Excuse me，can you tell me________？
—Sorry，I don’t know．You can go to the information desk．
| A．that there is a train | B．when the train leaves |
| C．which train can I take | D．where does the train go |
My mother prefers to take a bus to her office________she has a car of her own．
| A．if | B．because | C．although | D．until |