Use of English Part 4: Mixed tenses

Part 4 of the Use of English part has a section in which you are to decide the right tense to fill a gap (and write it correctly). The verb is given. This is the example provided at the official sample on http://www.caib.es/govern/sac/fitxa.do?estua=924793&lang=ca&codi=1002198&coduo=924793:

 At the Dentist’s 

I was on time for my dentist's appointment, but the dentist was still busy with another patient, so I (0) ...sat... (SIT) in the waiting room and started to read some of the old magazines lying there. While I (1) ... (WONDER) whether to leave and come back another day, I (2) ... (NOTICE) a magazine article about teeth. It (3) ... (BEGIN): 'How long is it since you last (4) ... (GO) to the dentist?. (5) ... (YOU GO) regularly every six months?”. Next to the article was a cartoon of a man in a dentist's chair. The dentist was holding a dental drill ready for use. The dentist said: 'I'm afraid this (6) ... (HURT).' I suddenly realised that my tooth had stopped aching. But just as I (7) ... (OPEN) the door to leave, the dentist's door opened. 'Next please,' he called. “Actually I am not here to see you, I (8) ... (WAIT) for my friend,” I (9) ... (SHOUT), leaving as rapidly as I could. Once outside the dentist I felt a terrible pain in my jaw. If I didn‟t want to live with this pain, I (10) ... (HAVE) to make another appointment.

Answer key:
1 was wondering  2 noticed  3 began  4 went 5 do you go  6 will hurt  7 opened  8 've been waiting
9 shouted  10 'd have  

Here are some links to practice.

http://www.ego4u.com/en/cram-up/tests/london-dungeon
http://www.eduhi.at/dl/MixedTenses_Letter1.htm
http://www.eduhi.at/dl/MixedTenses_Letter2.htm
http://www.ego4u.com/en/cram-up/tests/language-course
http://www.ego4u.com/en/cram-up/tests/james-cook