In order to gain a bigger share in the international market, many state-run companies are striving _______ their products more competitive.
---I was riding along the street and all of a sudden, a car cut in and knocked me down. --- You can never be ______ careful in the street.
A dozen ideas were considered _____ the chief architect decided on the design of thebuilding.
Scientists are trying to develop a special material, ________ they will make use of in spacecraft.
He was absent for two weeks, so he had a lot of homework to ________.
--- Do you think he will do me a favor?--- As far as I know, he is the last one to help others. He _______ be prepared to give you a hand, though.