Hi I have to get 120 in Dulingo test before 5/12. I got 105. How can i do that in a short period?! Please help!

Hello native English speakers. Query about another real three simple sentences. 1a. They have told us that they are not coming. 1b. They have told that they are not coming. Which is grammatically correct? From the 1a., can we regard the "us" as a indirect object, and the "that they are coming" as direct object? By the way if there is clear context , does the 1b. also grammatically correct? 2a. John is the tallest of them all, but is notwithstanding quite small. 2b. John is the tallest (man ) among all of them, but is notwithstanding quite small (my grammatically guess). Query : Is the 2b. (my guess) correct by grammar and logic? 3a. Your vegetable plot is three times larger than ours.(original) 3b. Your vegetable plot is three times as large as ours. 3c. Your vegetable plot is four times as large as ours. Query: Which is/are grammatically correct? Does the 3a. have fixed meaning or not? Which can express the meaning of the original(the 3a.)?

Can I use these words in front of teachers or it will be inappropriate, rude? Sorry if it’s a bad word.

It's a gloomy day. I spent most of the day in bed, feeling feverish and dizzy. The flu seems to have spread to Mom and Dad too. Now everyone has a fever. I didn’t expect it to be this contagious. Mom's a bit superstitious and thinks it might be related to the recent funeral, but we know it's just the flu, just some very malicious influenza virus.

1 Would you like to come and work in china ?

The word "stub" means put out a cigarette by pushing the end against something. Is this sentence grammatically correct? I wanna change the "put" into "putting", but someone told me it is the original sentence from an article written by a native speaker.