How do you improve your ________ —By reading aloud every morning.

When did you return to Nanjing last Friday?—It was not until midnight _______ it was snowing heavily.[ ]

It is these poisonous products ______can cause the symptom of the flu, such as the headache and aching muscles.

Your English is very good.—– .

If we don’t use money ， we’ll have a difficult time.