--- How do you find Mr Li’s lecture?--- Good indeed. It_______ many problems we have come across in our study.
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—The hall___ for international conferences is of great importance. —I see, and we are sure to complete it on time.
Since Tom ___downloaded a virus into his computer, he can not open the file now.
Seeing that the drowning child was struggling in the icy water, the soldier dived into the river without hesitation, ___ his own safety.
If you just spend your time___ gains and losses, maybe you'll get nothing in the end.