Won't be able to vs will have to

I .................. do it myself. I'm really tired.

• won't be able to

• won't have to

We .................. buy a car. My father will lend us his.

• won't have to

• won't be able to

I can't find my toothbrush. I .................. buy another one.

• will have to

• won't be able to

• won't have to

We haven't got time to do it tonight. We .................. do it tomorrow.

• won't be able to

• will have to

• won't have to

I'm really sorry, but I .................. attend.

• won't be able to

• will have to

• will be able to

Some scientists say, by the end of the century we .................. cure cancer.

• will be able to

• won't have to

He is ill, so he .................. work all the week.

• will have to

• won't be able to

• will be able to

She has a lot of money, so she .................. go on holidays in Europe.

• will be able to

• will have to

• won't have to

• won't be able to

I'm not sure you .................. do all that in one week.

• will be able to

• will have to

He .................. work harder if he wants to succeed.

• will have to

• won't have to

• won't be able to