Playing on a frozen sports field sounds like a lot of fun. Isn't it rather risky，__________？
| A．though | B．also |
| C．either | D．too |
I think you should go back to your plan, which is much more practical than the present one．
| A．random | B．abstract | C．original | D．ridiculous |
She has a gift for creating an atmosphere for her students ____allows them to communicate freely with each other.
| A．which | B．where | C．what | D．who |
___not to miss the flight at 15:20, the manager set out for the airport in a hurry.
| A．Reminding | B．Reminded | C．To remind | D．Having reminded[ |
The lack of eco-friendly habits among the public is thought to be a major _____of global climate change.
| A．cause | B．result | C．warning | D．reflection |
We are at your service. Don’t to turn to us if you have any further problems.
| A．beg | B．hesitate | C．desire | D．seek |