Please help if my answers are correct and let me know the correct answers below. thank you.

Can we see (1) _____ the earth is a globe? Yes, we can. When we watch a ship that sails out to sea, we can see that the ship begins (2) _____. The bottom of the ship disappears first, and then the ship seems to sink lower and lower, (3) _____ we can only see the top of the ship, and then we see nothing at all. Is the ship hiding from us? It is the earth. Stick a pin all the way into an orange and (4) _____ turn the orange away from you. You will see the pin disappear, (5) _____ a ship does on the earth.

1.1. if
2.whether
3.when
4.that
ans.1
2.1.to be disappeared
2.to have disappeared
3.having disappeared
4.to disappear
ans.4

3.1.since
2.after
3.unless
4.until
ans.4

4.1.reluctantly
2.accidentally
3.carefully
4.slowly
ans.4

5.1.the same
2.alike
3.similar to
4.just as
ans.4

All five of your "fill in the blank" answers are wrong. I don't know the questions for the others.

Yes, your answers are correct. The correct answers are:

1. whether
2. to disappear
3. until
4. slowly
5. just as

Here are the correct answers:

1.1. if - Correct
2.4. to disappear - Correct
3.3. unless - Incorrect, the correct answer is 4. until
4.4. slowly - Incorrect, there is no correct answer listed
5.4. just as - Correct