You would like to give 20% of your 45 marbles to your best friend. How many marbles would you give to your friend?

Let's cross-multiply.
Multiply the numerator of the first fraction by the denominator of the second:

$$5 \times 11 = 55$$

Multiply the numerator of the second fraction by the denominator of the first:

$$9 \times 7 = 63$$

Since $55 < 63$, the first fraction is smaller than the second.

Therefore, $\frac{5}{7} < \frac{9}{11}$.

3.3.2: $0.74 * 50\%$

$$0.74 \text{ and } 0.50$$

Since 0.74 is greater than 0.50.

Therefore, $0.74 > 50\%$.

The completed statements are:
3.3.1: $\boxed{\frac{5}{7} < \frac{9}{11}}$
3.3.2: $\boxed{0.74 > 50\%}$