1) ................................ have worked as a librarian in this school? a) Where b) What c) How often d) How long 2) Scientists have researched on Covid-19 ................... 2019. a) for b) so far c) since d) recently 3) Mrs Nelson is the best teacher he's ever ............................. . a) has b) had c) has had d) to have 4) The students cannot present their researches as they ........................... them yet. a) haven't finished b) didn't finish c) are finishing d) can't finish 5) A: "Why are you so tired?" B: "We have ............................ returned from work." a) ever b) never c) just d) often

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