—Can I come to ask for some advice at any time? —Yes, of course. .
Children’s brains can’t develop properly_______ they lack protein(蛋白质).
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 .