----Mr. Li told me once he had a fall and broke his leg . ----_______was that. A Since when B For how long C How long ago D How soon
________spending our vacation in the city,why not try hiking in the courtry?
— We should recycle everything we can. — Absolutely.These may seem little things,but they’re not__________it comes to saving the environment.
No ready technical data was ______________,but we managed to go without.
Every solid object______reflect a sound,varying according to the size and nature of the object.
Are you certain that this is _________in his speech?