verbs

Last week a tree surgeon _____ on a tree in our back yard.

• operate

• operates

• operated

• had operated

Every day for two weeks the tree ___ many leaves.

• loosed

• has lost

• will have lost

• loses

On any job this tree surgeon always ___ in the early morning.

• work

• will work

• had worked

• works

On our tree the surgeon used cement; before this job he ___ an asphalt-dust mixture.

• use

• uses

• had used

• will use

He ___ cement to all of his jobs from now on.

• apply

• applied

• will apply

• will have applied

Bark injury is the least difficult type of injury.

• S-LV-PN

• S-LV-PA

An injury to the tree cavity is more dangerous.

• S-LV-PN

• S-LV-PA

A diseased tree may appear fine outwardly.

• S-LV-PN

• S-LV-PA

The tree could be quite sick inside.

• S-LV-PN

• S-LV-PA

The two types of treatment for diseased trees are closed-cavity and open-cavity surgery.

• S-LV-PN

• S-LV-PA