_____ afraid _____ behind, Bill studied even harder than ever before.

　　A. To be； of falling　　　　　　　　　 B. Being； fall

　　C. Being； of falling 　　　　　　　　　D. To be； to fall

_____ afraid _____ behind, Bill studied even harder than ever before.

　　A. To be； of falling　　　　　　　　　 B. Being； fall

　　C. Being； of falling 　　　　　　　　　D. To be； to fall

_____ afraid _____ behind, Bill studied even harder than ever before.

1. A.
   To be； of falling
2. B.
   Being； fall
3. C.
   Being； of falling
4. D.
   To be； to fall

Students can easily fall behind in their studies ____ they don’t manage their spare time carefully.

Students can easily fall behind in their studies ____ they don’t manage their spare time carefully.

1. A.
   though
2. B.
   if
3. C.
   since
4. D.
   until