1.---What can I do for you?
---I'd like to buy a present for my son,______at a proper price but of great use.
A one B the one C which D that
2.Progress so far has been very good.We are ,________,confident that the work will be completed on time.
A.however B otherwise C therefore Dbesides
3.It might rain tomorrow,______we'll have to put off the sports meeting until next Friday.
A in case that B if possible C in case D in which case