Oil has become a very precious commodity ___ a limited reserve.

The separating effect of oil separator is not very good, the reason may be ___ .A.too litt

______the ground covered with ice, the road has become very slippery.A．AtB．AlongC．OnD．With

听力原文：Yoga becomes very popular nowadays, but it is important that we understand a few

Although he has become rich, he is still very ______ of his money.[2001]A．economicB．thrift

【C10】A．becameB．has becomeC．will becomeD．becomes

"The vase completely broken is a precious souvenir" has all the possible meanings EXCEPT _