Before __ the trunk must be checked.
This is the very toy car ________ which he came here the other day.
Spacecraft “Discovery” has failed in the course of launch. ----_______? They have been preparing for the test.
I began to fish before memory began, _______ I know I have always fished.
Elbert Einstein, for ______ life had once been very hard, was successful later in science .
In my opinion, all Mr Tom ______ good to his students in his class at present. He is very strict in their study.