1. He will agree to do what you require _D_ him.
A for B from C to D of
require sth. of sb. 要求某人做某事。
2. The mere fact _A_ most people believe nuclear war would be madness does not mean that it will not occur.
A that B which C what D why
fact后面要加同位语从句。考试网(www.Examw。com)
3. As teachers we should concern ourselves with what is said, not what we think _C_.
A have to be said B must say C ought to be said D need to say
4. Once environmental damage _A_, it takes many years for the system to recover.
A is done B is to do C does D has done
5. Studies show that the things that contribute most to a sense of happiness cannot be bought, _B_ a good family life, friendship and work satisfaction.
A as for B such as C in case of D in view of
contribute to 对…做出贡献。