________ you don’t know is that I spend ________ little time I had with my kids．
| A．That; that | B．What; how |
| C．What; what | D．That; how |
Special attention should be paid _______ our earth from _______.
| A．to protect; being polluted |
| B．to protecting; being polluted |
| C．to protect; polluting |
| D．to protecting; polluted |
The roof fell _______ he had time to dash into the room to save his baby.
| A．after | B．as | C．before | D．until |
Rock climbing is _______ great fun. You will get close to _______ nature and take adventures at the same time.
| A．/; / | B．a; / | C．a; the | D．/; the |
When the teacher came in, the students pretended _____ the text.
| A．to read | B．reading |
| C．to have read | D．to be reading |
In order to continue to learn by ourselves when we have left school, we must ______ learn how to study in the school now.
| A．in all | B．after all |
| C．above all | D．at all |