Exercise $13.$ Paying attention to the meanings of the sentences, fill in the blanks with the correctsubordinate conjunctions or similar expressions chosen from the pairs given in brackets.

I went for a walk the sun was shining. $($because$,$ otherwise$)$

Do you know he stores are open today? $($as if$,$ whether$)$

We recognized her at once,

$2.$ He kept reading we had not seen her for years. $($although$,$ in case$)$

$3.$ The moon will risn $\text{'}$ie fell asleep. $($for$,$ until$)$

$4.$ It looks. the sun sets. $($as soon as$,$ than$)$

$5$ the train will be late. $($while$,$ as though$)$

$6.$ We will not go skiing ie got her degree, she became a teacher. $($After$,$ Than$)$

$7.$ the weather is good. $($as if$,$ unless$)$

$8.$ he left, he made sure he had his keys with him. $($Before$,$ For$)$

$9.$ They have known her

$10.$ I must leave now she was a child. $($until$,$ since$)$

$11.$ What shall we do I have a great deal of work to do$.($as$,$ than$)$

$12.$ it rains? $($or else, supposing$)$

$13.$ The door was open, you read this book, you would be sure to enjoy it$.($If$,$ Until$)$

$14.$ I studied more we could hear everything. $($in case, so$)$

$15.$ We packed a lunch, he did. $($than$,$ whereas$)$

$16.$ I will join you, we knew we would soon be hungry. $($lest$,$ for$)17.$ the weather is fine. $($providing$,$ than$)$

$18.$ We must hurry, he is very busy, he is seldom at home. $($Or else, Because$)\_$we will be late. $($so that, or else$)$