Here is the Collect for 20 December, during this period of intense prayer and longing for the Lord’s Coming.
Deus, cuius ineffabile Verbum,
Angelo nuntiante, Virgo immaculata suscepit,
et, domus divinitatis effecta,
Sancti Spiritus luce repletur,
quaesumus, ut nos, eius exemplo,
voluntati tuae humiliter adhaerere valeamus.
This is from Rotulus 30 published together with the Veronese Sacramentary. It is not in any previous edition of the Missale Romanum.
O God, whose ineffable Word
the immaculate Virgin took up when the herald Angel was speaking,
and, having been made the dwelling of divinity,
was filled with the light of the Holy Spirit,
we beseech You, that, by her example,
we may be able humbly to adhere to Your will.
In this prayer we taking a moment to look back to the moment of the Incarnation, which made the Coming to light of the Incarnate Word possible for us.