第三节语法和词汇知识(共15小题;每小题1分,满分15分)11. —It looks heavy. Can I give you a hand?—__________.
Sarah pretended to be cheerful, ______ nothing about the argument.
The lecture, ______ at 7:00 pm last night, was followed by an observation of the moon with telescopes.
Marco Polo is said to have sailed on ______ Pacific Ocean on his way to Java in ______ thirteenth century.
The other scientists ______ to her ideas with a mixture of criticism and silence.
The country itself didn't have enough gas because of the war,so the government decided to ________ its gas supplies to other countries.