She and her family hid away for nearly twenty-five months _____ they were discovered.
| A．After | B．since | C．until | D．before |
I hate ___ when the weather in Changsha becomes freezing cold because there is no heater inside.
| A．this | B．that | C．it | D．so |
. --- Believe it or not, I passed the driving test at the first attempt yesterday.
--- Great! But remember you can never be ___ careful when driving a car in the street.
| A．enough | B．rather | C．quite | D．too |
--- Tom is so joyful that he smiles at everyone.
--- So ___ you if you get the first in the exam.
| A．do | B．are | C．would | D．will |
--- Who do you think ___ the book here?
--- It may be John. He was sitting here all the morning.
| A．was leaving | B．leaves | C．had left | D．has left |
David can speak idiomatic American English and yet, _____ English, he doesn't know it at all.
| A．how to teach | B．when it comes to teaching |
| C．when he teaches | D．however he teaches |