What is this invention?
Robot
Swimming caps _______ (wear) at all times in the pool by all members.
must be worn
identify the environmental problem
ice melting
Some houses in the town________ (build) hundreds of years ago.
were built
Our teacher ______ (be) happy if we _____ (do) our homework.
will be / do
If I ____(have) enough money, I _____ (buy) a big house.
had / would buy
what environmental problem is this?
Flood
The pet petter is a machine_________ will automatically pet your dogs for you.
which/that
c-o-e-k-t-r
rocket