Use past tenses, present perfect or past perfect tenses to complete these sentences

three clients since the morning.(contact)
i couldn't help you. problems.(not understand)
does he know about yet? (tell)
bill admitted that he catalogue to the agency. (not send)
as soon as i the message, i my house. (get, leave)
while maggie new jumper, jill and i (knit, read).

she has contacted three clients since the morning. (contact)

i couldn't help you. i didn't understand your problems. (not understand)

does he know about it? have you told him yet? (tell)

bill admitted that he hadn't sent the catalogue to the agency. (not send)

as soon as i got the message, i left my house. (get, leave)

while maggie was knitting a new jumper, jill and i were reading. (knit, read).

everyone at least once in a life passed some kind of exam. should we worry about the results of the exam after we did that? at first glance, an answer to this question seems to be a piece of cake. but people actually split down in the middle with no clear confidence. being in the dark about our mark makes us feeling nervous. some people even become down in the dumps, i mean, they fall into depression bothering themselves. they even may understand that it doesn’t make any sense but they commonly can’t help it. but there is a category of people that can manage to not let their hairs down. they stay still whatever they do, particularly, sit in for a test.

to conclude, i don’t want to beat around the bush, that’s why will tell you my clear viewpoint. i also think that feeling nervous while waiting for exam results doesn’t add up.

this summer i was in the camp. i was there for 3 weeks. there were many interesting things in the camp. every morning we did exercises. then we had our breakfast. after it we cleaned our rooms and territory of our camp. then we went to the sea. when we returned to the camp we had dinner. after it we slept for 2 hours. then we went to different   sections. in the evening we had supper and went to the disco. at 10 o'clock we went to sleep.