There are the tools_________ (with which / by which) to work

There are the tools_________ (with which / by which) to work there are many international organizations which work to sav 请问on which,by which,to which,from which,in which,with which, on which by which with which in which There are two methods by which hydrogen (氢) can be used to p 翻译There are many elephants which work for people. which boys are there? with which in which on which by which at which from which on Which one?There are two.Do you mean the one with （）neck? 英语翻译1.We are not conscious of the extent to which work provi Is there any reason to work here.Which is correct the degree to which they are roasted.