【推荐1】You will question __________ the voice you’re hearing is actually real. (用适当的词填空)

【推荐2】（2022年浙江1月）Cobb, for her party, started to ask conference organizers who invited her to speak ______ she could do so remotely. (用适当的词填空)

【推荐3】______ the new chemical pesticide is effective remains to be seen. (用适当的词填空)

【推荐1】The reason why the ponies here are naughty is __________ Haytor is a tourist-heavy area and tourists are constantly feeding the ponies foods, despite signs asking them not to. (用适当的词填空)

【推荐2】The question is ________ it is worth doing. （用适当的词填空）

【推荐3】He didn’t attend school yesterday, and that’s________ he got a toothache. (用适当的词填空)