---Answer the doorbell, please. It must be your uncle.
---It Heidi. She’s coming over this morning to help me with my math.
| A．is | B．can’t be | C．could be | D．will be |
The selfless village doctor treated whoever came to his family without any.
| A．charge | B．money | C．cost | D．price |
____ the crisis of economy getting more and more serious, the government is searching for ways to improve people’s life.
| A．As | B．With | C．While | D．If |
--Do remember to charge the battery for 12 hours when you first use it.
--- ________.
| A．Thank you, I remember. | B．What for? |
| C．Up to you. | D．Got it. |
We’d be very grateful if you could join us because your cooperation will _____ the timely completion of our project.
| A．reach for | B．make for | C．go for | D．stand for |
My mobile phone disappeared. Where _____ I have left it?
| A．may | B．must | C．could | D．should |