Susan heard some strange noise ... (while / after) she was doing her home-work.
while
We often play football ... (by / after) school.
after
Don't leave the house ... (during / until) mum comes.
until
I always wash my hands ... I eat.
before
(Until / Before) ... you start the experiment, you have to put on protective goggles.
Before
(When / During) ... I was going to school, I saw an owl in the tree.
When
(When / By the time) ... the film starts, I finish the washing-up.
By the time
Tom stopped reading ... (by / as soon as) 9 pm and at 9:01 he already fell asleep.
by
We are going to work with grammar ... (while / during) the next week.
during
(As soon as / While) ... you know your exam results, please tell me.
As soon as
I don't usually do anything special ... my holidays. I just lie at the swimming pool and relax.
during
... Rob was gardening, his dog was running and catching butterflies.
While
... you know the answer, quickly push the button!
As soon as
Please don't open the box ... (till / as soon as) your birthday.
till