Q.1.
He knew where the key was since he had seen her hide it.
Q.2.
Although he was tired, he carried on swimming.
Q.3.
... , he was very clever.
Q.4.
... because it was not possible to find it.
Q.5.
multicoloured, plastic flowers
Q.6.
fresh crispy carrots
Q.7.
He was a famous engineer ...
Q.8.
While waiting for him to return, ...
Q.9.
Wherever he looked,...
Q.10.
I knew how to do it.