are lacking vs are lack

Some examples from the web:

• In many cases concrete goals, measurable objectives and timetables are lacking.
• Above all, important institutional reforms are lacking in regard to the Council and Commission.
• I would like to list three elements which are lacking in my opinion.
• But obviously the rest of your manners are lacking.
• Subsidies are not enough to ensure development when infrastructure and public services are lacking.
• Enzyme replacement therapy provides patients with the enzyme they are lacking.
• Data are lacking regarding effects on CYP2C8 and CYP2C19.
• The relevant precautions are lacking, as is positive assistance to Mexico.
• If suitable in-service testing results are lacking, type tests shall be performed.
• Such reasons are lacking in the present case.
• He'll build it with two things that are lacking in this room...
• We currently are lacking the accurate statistical data that we need to assess the situation.
• Hazard maps are lacking in many European countries and regions.
• The most important tasks is a solution to the question of radioactive waste, and especially final disposal of spent nuclear fuel, to which technology exists but political decisions are lacking.
• Replagal is designed to replace the human enzyme, alpha-galactosidase A, which people with Fabry disease are lacking.
• Fabrazyme is designed to replace the human enzyme alpha-galactosidase A, which people with Fabry disease are lacking.
• Furthermore, we are lacking information and statistical data on which industry can base its investments.
• The fact is that Europe really can make a difference, but if financial resources are lacking European added value will be zero.
• However, sound pre-conditions to guarantee the return of these researchers are lacking in Europe, so that sometimes they prefer to stay in America.
• We have, unfortunately, seen what can happen when they are lacking.

Some examples from the web:

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