we must begin testing this instrument,no matter___difficult it is A :what B:how 为什么不能用A呢

we must stop ------(talk)when class begin We must get there before it ___(begin)to rain. 英语改错we must hurry,other wise the meeting will begin when we get there 英语翻译开头 We begin. i英语选择in learning a foreign language ,we must begin with ---- 为什么是speech?不加冠词么? we must begin testing this instrument,no matter___difficult it is A :what B:how 为什么不能用A呢 We must They must remember when they __(begin). shall we begin our lesson we must() to the driver when the bus is movingA stop to talk B begin to talk C beginning talking D stop talking He ______ there before I rang him(get)Older people must __ to politely (speak)At the ______ of the class,we had a test(begin) 英语翻译（1）We must make our planet greener.We can do a lot of things about it.Let`s begin today.(2) We should keep our rivers and oceans clean.Weshouldn`t make them dirty. We must value what we We must ( )(work)hard. we must call the We must help them? we must help it why we must sleep