_______ I take part in a group discussion or try to speak English to someone, I find it difficult to express myself.

A. If only           B. Every time      C. Now that       D. In case

—________Bob take part in designing the energy saving houses?

—All right.It’s said that he has rich experience of this.

A．Would                                               B．Should 

C．Shall                                                 D．Need

________ I take part in anything that's illegal.

1. A.
   refuse
2. B.
   refuse to
3. C.
   accept
4. D.
   accept to

________ will take part in the physics contest will be announced at tomorrow's meeting．

1. A.
   Who
2. B.
   Whom
3. C.
   Which
4. D.
   That