关于高中英语倒装句的几个问题

关于高中英语倒装句的几个问题
1 ______ ,we were not going to make any concessions to his unreasonable demands.
A What may come B.Come what may C.May what come D What come.
2.Heat doesn't travel by convection in solid ,because the solid does not move ,____.
A .so does a liquid B .so a liquid does C.as does a liquid D.so is a liquid.
3 ____ do we go for a picinic.
A Seldom B Sometimes C Certainly D Once.
4_____ is it only the ignorant and ill-educated person who has such faith in the bottle of medicine.
A Either B Often C Nor D Usually .
5 _____ ,I must do another experiment.
A Be it ever so late B It is ever so late C It be ever so late D So late it be ever