While we (did/ were doing) an experiment in chemistry, I used the wrong substances and (caused/ was causing) an explosion!

If you need a visa to visit the UK, you must (get/ to get/ getting) the visa before coming and you (must/ musn't/ should) stay in the country after your visa expires.

I (am going to/ will) see my sister in April.

This sentence represents which conditional: We would have a greener world, if we produced less rubbish.

(Fill in the blanks with gerunds and infinitives): _______ (get) dressed up for a special occasion is especially colorful at the Goroka festival in Papua New Guinea. People come from near and far _______ (show) their dances.

If you want to be a lawyer, you (must/ don't have to) study law.

Insert this adverb in its correct place: I'll watch it on TV. (definitely)

'I watched YouTube videos,' said Sara. Please turn this sentence into reported speech.

She's always tired. She (should/ could/ shouldn't/ couldn't) go to bed late every night.

Georgia Shields is a young woman (that/ who/ where) aims to be the world rallycross champion.

I'd (recommend/ recommending) this book - you'll enjoy it if you (like/ will like) classic adventure stories.

(Indefinite pronouns) There must be ________ we can do to help!