is even more important is the earth cooled down, water began to appear on its surface.
| A．When; that; when | B．What; whether; as | C．What; that; as | D．lt; whether; as |
He is only too ready to help others, seldom, ____, refusing them when they turn to him.
| A．if never | B．if ever | C．if not | D．if any |
——The weather is too cold ____ March this year.
——It was still ____ when I came here years ago.
| A．for; colder | B．in; cold | C．in; hot | D．for; hotter |
Many buildings in the city need repairing, but the one ____ first is the library.
| A．repaired | B．being repaired |
| C．repairing | D．to be repaired |
He didn’t make ______ clear when and where the meeting would be held.
| A．this | B．that | C．it | D．these |
It was raining heavily. They could do nothing but ______ at home.
| A．to stay | B．stay | C．stayed | D．staying |