But balloons and the cigar-shaped airship, which was invented slightly later, did not solve the problem of flying because they had no means of power or control.

The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.

The study highlights how our sense of right and wrong isn't just based on _, religion and philosophy, but also on the biology of our brain.

The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.

The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

P eople used to think the development of electronics may (  ), but now more and more letters and documents travel electronically.

It was initially called One Belt and One Road, but in mid-2016 the official English name was changed to the Belt and Road Initiative .

People used to think the development of electronics may (  ), but now more and more letters and documents travel electronically.

The arts and crafts are not only the embodiment of the people's longing for _______ for themselves and as gifts for others, but also great ______ for China and the rest of the world.

The US has made some concessions, but also threatened to ____ economic and military support.

3.True,the furnishings are dated(陈旧的) but in general, the hotel is very clean and the staff very friendly.( )

Seeing the big crowd coming towards him, he started to run down the hill, but ______ and went down on his hands and knees in the melting snow.

8. He and Jeannie used to live together, but recently they have been for the first time.

Ron does nothing but _______(critic) and complain all the time.

13．In the N of the Strait, the mean winds during December to March are force 4 in the NW and NE but ______around Singapore and the S part of Malacca Strait.

All cultures require and value politeness, but the ways in which politeness is achieved may varysignificantly.

The house was _____ with carpets and chairs, but no table and cabinet（）

听力原文：W：Well, the atmosphere was nice, but the meat was tough, the potatoes were cold, and the service was terrible

______is formed when the leaner attempts to learn a new language, and it has features of both the first language and the second language but is neither.

Both the blue pink and the blue dressesarepretty but I like the _____ better.

The reporters gathered around him and interviewed him, but he______their quests.

The primary objective of Basic Econometrics is to provide an elementary but comprehensive introduction to the art and science of econometrics.

But the human mind can glimpse a rapidly changing scene and immediately disregard the

But one of the most telling lessons Ellen and I got in the difference between Chinese and American ideas of education came not in the classroom but in the lobby of the Jinling Hotel where we stayed i

Classical Hollywood explicitly extols success and wealth but is at the same time asham