Explanation

 The completed proverb is: "A leopard cannot change its spots." 

Explanation

The completed proverb is: "A watched pot never boils." 

This proverb means that when you are anxiously waiting for something to happen, it can seem to take longer than it actually does

Explanation

Those who live in glass houses should not throw stones."

 It's a proverb meaning people shouldn't criticize others when they have similar faults.

The word "should" indicates a moral obligation or advice.

Explanation

 So the complete sentence reads:

“He is harvesting the crop when it has ripped.”

“Has ripped” is the present perfect tense, which fits here because it refers to something that has just been completed, prompting the current action (harvesting).

Explanation

"Will" is used to express future predictions or certainty, like weather forecasts.

So, "There will be heavy snow tomorrow" correctly predicts future weather.

Explanation

This is a present perfect continuous tense.
Structure: have/has been + verb-ing
We use it for actions that started in the past and are continuing.
"Since last morning" indicates a specific point in time, which matches this tense.

Explanation

We use the present continuous tense here because it describes an action happening now.
Structure: are + verb-ing
"You are looking for someone" is the correct form.

Explanation

If the phone was working, I would call you.
This is a conditional sentence (Type 2).

The structure is: If + past simple, would + base verb.

Explanation

 Noman does not look very interesting in the plan.

 For third person singular (he, she, it), we use "does not" for negative present simple.

Explanation

 Passive voice in past tense: was + past participle.

"Was not called" is correct.