1. Due to the fire we ____________ on 17.06.2012, we regret to inform you that we will be unable to ship the merchandise for your purchase order #111 as scheduled.

sustain
sustained
sustaining
sustains

2. We look forward to your future orders and __________ready to assist you in any way possible.

is
are
be
do

3. Should you care to ______________ this matter further, please feel free to contact me at the above number.

discuss
discussed
discussing
discusses

4. We regret to inform you that __________ order cannot be filled at this time due to the following reason.

saying
said
say
says

5. Otherwise, we will _________ no alternative other than to forward your account to our attorney.

had
having
have
has

6. Therefore, we must insist that payment be __________ within ten days of this notice.

receiving
receives
receive
received

7. We have invested much time in ___________ to work out arrangements for the payment of your account and it seems that each agreement is met with a lack of productivity.