A)   could benefit

B)   would benefit

C)   benefited

D)   No improvement

A) why he wrote the letter was since

B) for which he wrote the letter because

C) why he wrote the letter was that

D) No improvement

A)   have been waiting

B)   had waited

C)   has been waiting

D)   No improvement

A)   there is no more seat

B)   there is no more space

C)   there is no more accommodation

D)   No improvement

A)   have had nothing

B)   has had nothing

C)   did have nothing

D)   No improvement

A)   you clearly to understand

B)   you to understand clearly

C)   to clearly understand you

D)   No improvement

A) on 14 July in the year 1960 at 11pm

B) in the year 1960 on 14 July at 11pm

C) at 11pm on 14 July in the year 1960

D) No improvement