45.()cleans the blackboard should be praised.

49.They had to put ()the meeting due to the ongoing COVID-19.

48.Though we hadn＇t met each other for 30 years， I recognized him()I saw him.

47.The Great Wall is a great tourist ()drawing millions of visitors every year.

46.It won’t do us any good， but it won’t do us any harm().

45.I’m sure that reserves of coal here are ()to last for at least of half a century.

44.He has made it clear ()he will never go back on his word.

43.What John said just now had little to do with the question ()discussion.

42.The man tried to force the locked door open but ().

41.Andrew’s sun-tanned face is a suggestion that he ()in excellent health.

40.His efforts to develop new energy sources ()to be rewarding.