好老师总是供不应求。

Good teachers are always ___in ___demand.

许多商品没有需求，因为每个家庭都生产自己的商品。

Many goods are not ___in ___demand because each family produces its own goods.

熟练的数据科学家在各个行业都很抢手。

Skilled data scientists are ___in ___demand across various industries.