Choose the answer that completes the sentence ¾ Let me know ¾ you will return or not.

1.If we want concrete proof, we are looking for ¾.

2.A lexicographer is a person who writes ¾.

3.Please ¾ sure your seat belt is fastened for take off.

4.¾ the formation of the sun, the planets, and other stars began with the condensation of an interstellar cloud.

5.The synonym of '$genesis^{\prime} is$ ¾.

6.¾ 1000 species of fish have been identified.

7.Choose the correct one.

8.Farmers look forward to ¾ every summer.

9.Neptune is an extremely cold planet, and ¾.

10.It is important that the Admission Office ¾ your registration.

11.Unless you work hard, you will not succeed. Here, '$Unless^{\prime} is used as$ ¾.

12.When ¾ computer invented?